Could you get us a picture of the back of the mini? You posted two of the same pic
Anyways, I\'m actually impressed. Your on the right track a few things I can mention;
1) Outline
This is done easiest by using the undercoat. Specially at the mask ( as mentioned by the two others) you paint the white, but don\'t go all the way to the edge.
2) Eyes
Paint the eyes a contrasting colour to the colour on the face, red or green here would be awesome.
3) Thinning
Thin down your paints so they don\'t clutter up, a bit of water untill you feel it\'s enough should do the trick. Down the road you will do this by heart, it might take a few tries to begin with.
4) Colours
Use different colour shades of the colour your trying to highlight. I can see you\'ve used white to make the red and yellow brighter, this is not a bad idea, but it will show. Yellow turns bleachboney and red will turn pink. Instead use a brigher yellow or red to bring the highlights up.
There are probably 100000 more things I could say, but try these things out and post again

For all in the world, keep trying.
Feel free to PM me with your new minis if you liked my advice or just post here and I\'ll see what I can say.
Overall!
It looks like you got the hang of alot of things, your a great WIP
