It's probably best to get a qualified saddle fitter out to look at it. Noone can tell from pictures if the saddle is the right shape for your horses back. It may be bridging or pinching and without feeling it and seeing it in the flesh then its impossible to tell. I feel your pain though, I am having to have a saddle made for my 4yo at the moment. Difficult horses!!
An experienced eye can tell a certain amount from photos - not the same as seeing it in the flesh, but it can help. You do need to know the skill level of the person commenting though, I have seen some very interesting comments made about photos of saddles on here!