I think you've done a great job so far!
But as Aginor and Crowsfoot have already suggested, you need to apply more wash to the model. Right now, it doesn't show. (It could be the flash of your camera taking out a lot of it, but usually a good wash will still show even through a flash like that.) Don't be afraid to go heavy with a wash. You want to go for a stark contrast there, because that is what will give your model shadows and depth. Otherwise, it just looks very flat and plastic.
A good wash will also start to blend your colors together more. By this I mean, your white and purple areas are in VERY stark contrast to one another and that's not always what you want. Some things it's okay to have that effect (like when you want a glowing weapon, so a bright orange will contrast nicely with a darker background color) but on skin, you don't see that very often and there is usually a bit of a transition between the two colors, even if it is as slight as a thin line. A wash can start to "blur that abrupt line and make it easier for the brain to make that transition from on color to the next.
Typically, with metals, you want to go with a black wash (like Nuln Oil) and earth tones, go for something like Agrax Earthshade. Those two washes should be the first two you ever reach for and should be the two you always have in your paint stock. Sepia is another good one, but a lighter shade of brown (a bit more on the orange-y side) and is very good with skin tones. I find that red washes need more contrasting colors to really show up well, meaning that you might have to do a bit more layering with red washes.
The next step you'll need to learn will be highlighting and drybrushing. Those two (especially drybrushing to begin with) will take your painting to the next level!
