wow, first of all, that's a really nice vector so far! second of all, it's a little more difficult to decide
because the original scan uses soft cell-shading. It depends on how you want your vector to end up. If you're going
for a strict cell-shading effect, then what you're doing is fine. But if you're going for something
that's a little closer to the effects on the scan, try using gradient or some soft brushes to connect the colours a
bit more.
anyway, those bright yellow strands on her hair is perhaps a bit too bright. The shaded blond is a tad too dark and too
much contrast with the base colour, or you can darken the base colours a bit as wel. the red on her shirt looks fine to
me, it's just that on the scan, there's a very bright source of light, so there's that patch of colour
where the sun directly hits it. I'm not sure if you're changing the source of light (not the direction, but
just what's creating the light) or not. Also, the scan uses warm tones due to the lighting, whereas you're
using more neutral colours, which is fine, again, depending on what you're trying to create.
The leather straps look fine to me at this stage, though it's hard to tell because there are still gaps between the
scabbard and her shirt, so it's a little difficult to see if the colours clash or not.
Also, again, it depends on what effect you want. If you want a softer image, have the base colours closer to the
shading/highlighting colours (like the base colour on her hair and that one lighter colour on it). Or if you want
something crisper, use slightly more contrast in the shading colours. I usually use something darker and less-saturated
than the base colour, but normally with the same hue.
Hope that helps!
