Not too keen on the highlighting. You used some black ink as well, didn't you?
From the face I can see you've got a steady hand (some people just paint a blob instead of eyes

) but I think the problem here is that you used a "lemon" yellow over orange. You should do thinner lines (even if you have to cover half of it with the base colour) and try using a colour one step directly above the orange - there are a number of guides on the net on how to do it.
And I think you should drop the black ink, it's good as shading if you use it carefully (around the edges where the armour plate meets the undersuit, or around the raised stones) and the ink would work a lot better on a model with large surfaces like an Eldar.
Remember to post more pics

(and get rid of the hair next to the Fire Dragon

)