I'm pretty satisfied with how the Doctor and Tuvok came out. Finding a decent image of Chakotay that would work was tough... I think I got a pretty good one, except for the lighting being a bit off. I darkened the hands a bit to more closely match his facial complexion. Getting the head size just right is a bit tricky... I try to judge it by matching the facial features scale with the original. The hand size differences make it difficult as well (head should be small for the foreground hand and large for the background hand).
Any suggestions on improvement?