I agree with the others about the last shot. It's a great shot but the subject might work better a little off center. You probably don't have to move it much because the chair's back actually helps to through the subject area a bit off center.
Actually the more I look at it with more focus on the chair, your composition seems to work fairly well as is. Let's see what more people have to say. What I can definitely say is that it has some great colors. Good work.