looks good for first try.
for the texture, what most bothers me right now is the facial hair as it look pasted on, especially the one around the chin area. Basically just try to make them blend better with the skin. Personally I paint some of my textures, but others use different techniques, so just try things out and see what's better for you. As for blending the color of the custom face with the default skin, just play around with hue/saturation and levels in Photoshop (or GIMP, whatever you use). This is a matter of personal taste though, because personally I like to make it more generic like the way 2K has it, as compared to some guys who like it really detailed (like Amarowaade).
headshape, it looks decent but there's a lot of places that can be worked on. first is around the top of the head, it should have a more triangular shape than the more round one you have right now. For the ears, you have to extend the earlobes out a bit. For the nose, see how flat his nostrils are when you look at him in front, compared to how you can really see them in your CF. Some more I can see right away is that angle of the eyes is a bit off, his upper lip should be thicker, and just more general work on the whole head.
Hope this helps, good luck!
