You did a nice job. I have built Kirk and Scotty and still have McCoy waiting to be built. However, after seeing what a terrible likeness the kit's face is, I may never built him. Also note the hands are out of scale, way too large. Same on the other two figures.
In general, these are terrible kits. The fit of the top half to the lower half of the body, and arms to body, is not even close, and requires tons of putty to make it look right. Vinyl, in general, is a difficult media to work with.