This is my first Ork Nob that I painted. I didn't have any highlight over goblin green for the skin (I need a paint fund) and I fixed that problem with the thumb. Comments Welcomed!
Actually...I think too many Orks are highlighted to a comical green. Yours looks great. If anything, I'd base the skin darker, then paint it exactly the way you did...as to avoid the comical "neon-green" Orks we've all seen. Your Klaw looks good, the only change I'd make it to use a watered down, dark brownish-black to make the blood look more like blood...and hit up his red eyes with the same wash. I's probably do his teeth in a duller colour...because this Ork looks like he's been brushing regularly. LOL
Wonderful job.