Technical problems. Cause?

My illustration was rejected due to "technical issues". Please, tell me, what could be wrong?

My illustration was rejected due to "technical issues". Please, tell me, what could be wrong?
Adobe don't look at work with an artist's eye, which can be difficult for the artist. But for my personal opinion: I see on three sides a picture that is complete, but on the bottom a picture that is cut off in a straight line. I would expect to see the ground/shadow beneath the horse to also be complete. But it's hard to know what Adobe will accept for art: they might decide the left side of the man's face is "underexposed" because they judge it the same way as a photograph!
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