The sword looks flat, another color shod have been a better choice also to use more colors then just one. You get a really big white area. The yellow need a wash, maybe a thinned out yellow + brown or yellow + flesh wash. It need some shades.
The hair are painted over black? Have you used white as base over the black, if not you shod do that. The colors looks dull. The face also need some shades, a dark wash or own mixed colors that are tinned out. Some dark red shod look good.
The purple also need some shades. Are the "spots" on the purple yellow or gold? It shod look better if you had some shade where the purple meets the gold.
The gem looks nice and so dose the green. Over all the colors looks a bit thick. Have you used white or black under coat?
I shod use white if you paint a model with those bright colors.
It looks like you have given it a go and tried out some new stuffs. Its good that way co can become a better painter. Over all there is two things that can be improved. The shades and the thick color.
Good luck hope I helped a bit
