The model above is a great starting point. With a little bit of citadel washes (to begin with) and a few extra colours you can turn that model into a real nice peice.
I'd recommend getting some Ogryn Flesh wash, then a Thraka Green and a Asurmen blue for the respective colours. Put a small amount on first and see how it shades the colours respectively. If it needs a bit more, add a bit more to add some more depth.
When it comes to painting the face, once it's washed and dry, the easiest place to start is paint with the original colour these main areas:
- Bridge of the nose
If you highlight these areas first it'll give you great scope to then if your feeling adventurous, add a lighter shade to the mix and then hit the very tips of those edges (edge of chin, end of nose etc.) That will help the skin tones plenty.
With regards to the cloaks, remember to leave the shaded colour in the recesses, and then simply add the base colour on the raised area. It's a simple one step shaded technique. Then once thats done, you can add a bit lighter areas to the very highest areas.
I'm hoping these tips helped, if you get stuck get to where your stuck, take a photo and post up, i'm sure we can help you with some of the finer details.
Good luck with it, we are all here to help