I think the picture is not as bad as they make out, but then again some people are very fussy when it comes to stock, they have to be as their business reputation relies on the photography you are submitting.
As for the picture, in my opinion the shadows are perhaps a little harsh? If the lighting was lower and from the 10 O'clock and 2 O'clock positions, perhaps you could have achieved the blown background, whilst retaining detail in the white of the cut lemon? |