OK, it's not a bad start, you need to concentrate on getting your whites smoother. Use a spray primer rather than brush-on. White is a very difficult colour to paint well (heck, I'd shy away from an all-white army). The problem is, unless you shade the white, it looks like it's just primer. So I'd try and find a light grey primer (auto shops should have this in abundance) and work your white up from there - drybrush it on if you have to!
The blue is not bad, but your highlighting is a bit rough. Instead of highlighting, try using a slightly lighter blue, then washing with asurmen blue a couple of times for shading.
Your gold is not mixed well enough, and could really do with a wash of ogryn flesh, and the stormbolder would look much better with a wash of black.
Keep on trying though - we like to see improvement!