Thank you all for the great critics and kind words, both are very appreciated.
Thrace - That is something I struggled with. I wanted the roll-back key thingy of a sardine can but it keep getting in the way of the silhouette of the mouse. Switching it to the other side helped a little but not really. I really like the idea of having him place his hand on it. It would have also tied everything together better. Great idea!
Carey - I will add a second yay watercolor!!! I love the idea of having his left foot visible on a seat (thimble, spool, etc) and agree that it currently does look awkward. He either has to be in pain as you mentioned or a ballerina (standing on his toe).
Naroth - Thank you for the kind words about my line work and watercolor, I have really been trying to improve in both. I agree that the sketch is better. I was trying to figure out why as well. I think it has more energy (as you mentioned). Also, possibly more appealing proportions and a slightly better pose for the mouse (in the sketch it feels like he is leaning a little back, in the watercolor this is lost and he is just leaning left).
Steve - Thank you. I had fun with this piece and have a few more in this theme that I am working on or are bouncing around in my head.