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How to take progress photos that line up, week after week

A progress photo is only useful next to another one. If the light, the distance or the pose changes between them, you end up comparing photographs, not your body. Here’s how to set up once and take photos you can trust.

By the Shapen team at Minimaapps · Published · How we write about health

Why consistency matters more than the camera

Clinics that photograph bodies for before-and-after comparisons solved this problem long ago. Their rule is to use “the same camera lens, lens setting, lighting … and patient position to ensure reproducibility and to enable valid pre- and postoperative comparisons” (DiBernardo et al., 1998). Body-contour clinics add standard views, lighting and backgrounds for the same reason (Gherardini et al., 1997).

Each variable changes what you see:

  • Distance changes proportions. A camera close to the body exaggerates whatever is nearest. In a study of faces, a photo taken at 30 cm made the nose look about 30% wider than one taken at 1.5 m, where the distortion essentially disappeared (Ward et al., 2018). Arm’s-length selfies can’t be compared fairly with photos from across the room.
  • Light changes shape. Light from above deepens shadows and makes muscles look more defined; flat light from the front hides them. A change of light can look like a change of body.
  • Pose changes everything. Researchers photographing patients after major weight loss found that arm position alone affected shadowing, obstruction and distortion (Wong and Vinyard, 2014).

None of this needs a studio. The task is to keep things the same, which is achievable at home (Persichetti et al., 2007).

Set up once

  1. Pick a spot and keep it. A plain wall or door behind you, nothing cluttered. Mark where you stand and where the phone goes with a small piece of tape on the floor.
  2. Fix the light. Use the same room at the same time of day. Face the main light source, such as a window, rather than having it behind you. Avoid a single bulb directly overhead.
  3. Put the phone at mid-torso height, level, and step back. A tripod, a shelf or a stack of books works. About two metres away is a good distance: in a 2025 study of photo-based body fat estimates, the phone sat on a stand about 2 m away (Ferreira et al., 2025).
  4. Use the timer, not your arm. A 10-second self-timer gives you time to get into position.
  5. Wear the same thing. Fitted clothing or swimwear, the same each week. The same study listed loose clothing, dark or blurry images, a tilted camera and too much distance as things that make photos less reliable.

Take the photos

  • Front, side and back. Three poses cover most of what changes. Keep the order the same. A pose-by-pose checklist is in progress photo poses.
  • Stand naturally. Feet hip-width apart, weight even, arms slightly away from your sides in the same position each time.
  • Breathe out normally. Don’t suck in or push out.
  • Relaxed first. If you also want a flexed photo, take it after the relaxed one, never instead of it. Relaxed photos are the ones you can compare.
  • Same time of day. Many people choose first thing in the morning, before eating or training, because it’s the easiest moment to repeat.

How often

Once a week is enough. Weekly photos are frequent enough to build a habit and far enough apart to be worth looking at. Change is slow, so the useful comparison is usually four to twelve weeks apart, not this week against last. The full case for weekly over daily is in how often you should take progress photos.

Compare them fairly

Put two photos side by side at the same size, and compare front with front and side with side. Look at outlines (the waist, the shoulders, how the arms hang) rather than skin or shadows, which change with light. If one photo was taken in different conditions, leave it out of the comparison rather than drawing conclusions from it.

Keep them private

Progress photos are personal. Keep them somewhere that isn’t shared with a backup you don’t control or a photo stream other people can see. If an app asks you to upload them to its servers, it’s reasonable to ask why.

Doing this with Shapen

Shapen was built to make these photos line up. Last week’s photo sits faintly over the camera as an outline, so you step into the same pose and distance every time. Front, side and back are built in, there’s a timer, and your photos stay on your iPhone, with no account and no Shapen server. On iPhone Duo, stand the phone half-folded and it becomes its own tripod.

When you’ve a few weeks of photos, see what they show alongside your measurements in how to tell if body recomposition is working.

References

  1. DiBernardo BE, Adams RL, Krause J, Fiorillo MA, Gherardini G. Photographic standards in plastic surgery. Plast Reconstr Surg. 1998;102(2):559–568. https://doi.org/10.1097/00006534-199808000-00045
  2. Gherardini G, Matarasso A, Serure AS, Toledo LS, DiBernardo BE. Standardization in photography for body contour surgery and suction-assisted lipectomy. Plast Reconstr Surg. 1997;100(1):227–237. https://doi.org/10.1097/00006534-199707000-00034
  3. Persichetti P, Simone P, Langella M, Marangi GF, Carusi C. Digital photography in plastic surgery: how to achieve reasonable standardization outside a photographic studio. Aesthetic Plast Surg. 2007;31(2):194–200. https://doi.org/10.1007/s00266-006-0125-5
  4. Wong MS, Vinyard WJ. Photographic standards for the massive weight loss patient. Ann Plast Surg. 2014;73(Suppl 1):S82–S87. https://doi.org/10.1097/SAP.0000000000000249
  5. Ward B, Ward M, Fried O, Paskhover B. Nasal distortion in short-distance photographs: the selfie effect. JAMA Facial Plast Surg. 2018;20(4):333–335. https://doi.org/10.1001/jamafacial.2018.0009
  6. Ferreira TJ, Salvador IC, Pessanha CR, et al. Advances in the estimation of body fat percentage using an artificial intelligence 2D-photo method. npj Digit Med. 2025;8(1):43. https://doi.org/10.1038/s41746-024-01380-6