That was a major problem. The colours you picked didn't follow a colour gradient, so they looked out of place, and also washed out.
I also recommend redoing the head yourself, so you can try out some of the techniques I used.
The worst problems with the outline were the jaggies. They were all over the place. If you're making a curve, try to use a consistent pattern. One of the horns on your outlines had something like a 2-5-2-1-3 pattern, or something equally ridiculous, which I replaced with 5-4-4.
As for the neck so far, your jaggies are still there (take a look at the top, you've got a 5-4-1-4 pattern, which is just stupid). The shading is nice, but not following the lightsource. Remember, all the light is coming from the left, at the moment, and your scales make it appear to come from just above the viewer, while the head is still using a left-based lightsource.
I also recommend redoing the head yourself, so you can try out some of the techniques I used.
The worst problems with the outline were the jaggies. They were all over the place. If you're making a curve, try to use a consistent pattern. One of the horns on your outlines had something like a 2-5-2-1-3 pattern, or something equally ridiculous, which I replaced with 5-4-4.
As for the neck so far, your jaggies are still there (take a look at the top, you've got a 5-4-1-4 pattern, which is just stupid). The shading is nice, but not following the lightsource. Remember, all the light is coming from the left, at the moment, and your scales make it appear to come from just above the viewer, while the head is still using a left-based lightsource.