People tend to push up the shoulder on the opposite side of the weight-bearing leg. It's a structural thing that you couldn't really change anymore, so I leave this as an advice for the next piece. This is, to me, largely the problem with this piece.
If the bird holds up the cage with its left arm, the weight would normally fall on the right leg. You have it the other way round, this causes the unnatural looking pose.
Other then that, I think I really like this. Good job
