The figure is highly movie-accurate, and I thought do a brief tutorial on how to paint up a model in the official Colonial Marine colours. (Forgive some of the blurred tutorial shots; the end product is shown in (hopefully) better clarity!)
I use lots of different paints by a variety of manufacturers, but most of these choices can easily be changed to straight GW colours if you'd prefer!
1. Undercoat with black spray
2. Base with sand, then paint according to choice (I used Rhinox Brown, drybrushed Calthan Brown, drubrushed Tau Sept Ochre then a light drybrush of Terminus Stone)
2. Paint fatigues with Khaki
3. Paint Agrax Earthshade into creases, then touch up wash with Khaki again
4. Highlight raised areas on fatigues with Ushabti Bone
5. Highlight most prominent raised areas with Screaming Skull
6. Paint small random camouflage patterns on fatigues with Graveyard Earth
7. Do same with Cayman Green, overlapping some Graveyard Earth patches
8. Paint all armour sections with Orkhide Shade (note that the picture is wrong!)
9. Edge-highlight armour with Cayman Green
10. Repeat highlighting of most raised edges with Camouflage Green
11. You could leave the armour plates there - having them as block colours differentiates them from the fatigues - but I wanted to be movie-accurate! So I painted Rhinox Hide and Abaddon Black camouflage patterns onto the armour
12. Skin painted with Bugman's Glow
13. Wash skin with Ogryn Flesh
14. Highlight skin with Cadian Flatten
15. Highlight skin again with Kislev Flesh
16. Highlight all black areas with Mechanicus Standard Grey, then pick out edges with Dawnstone
17. Any final details can be picked out with Leadbelcher, washed with Nuln Oil, then picked out again with Ironbreaker
18. Add static grass or other basing material as appropriate
Here's the finished model:
Hopefully you found that tutorial of use!