1. The Camera must be set for at least 4 megapixel.  Iphone 4s and newer all have adequate resolution.  When you transfer an image from your camera, make sure it is not set to compact the image. 

2. The Camera must be held in portrait mode so that the longer direction of the target matches the longer direction of the camera aspect ratio. Portrait Mode.  Handgun Analyzer will flip the image, but why would you throw away resolution?

3. The photograph must include the entire target so that the orange corners have a white border around them.  Cutting off part of an orange marker is one of the most common problems.

4. The target should be hung flat to avoid shadows and creases.  Store targets rolled up in the vertical direction, they will relax better when placed on the target stand.

5. The photograph must be focused properly.  For best results go to camera settings and set the focus method (sometimes called Metering mode)  for multi-point or matrix.  If it does not look in focus, just retake a second picture 6 inches further away.  This normally shifts the auto focus of the camera and at least one picture will be good.

6. The software is somewhat forgiving for gentle shadows and imperfections on the image.  Try to make sure you don't have a bright sun reflection off the bull or edge markers of the target.  Stepping back and adjusting up to a 2x zoom is a good habit.

7. If you have a smart phone or tablet, you can make sure your picture works right there, otherwise it is good practice to always take 2 photos, take one step backwards for the second photo.

8. The software corrects for keystone, but the best precision is always a photograph perpendicular to the bullseye.

9. Indoor photography is tricky which pro photographers can explain.  Basically try to avoid single light sources above or to the side.  The further you are from the closest light source the better.  When I shoot at an indoor range, I use my stall light but move the target out to a 2X zoom.