Uri,
I'm not the greatest painter myself, but I'm doing my best to teach my son to paint, yes. We've also persuaded my wife to help paint some of his army, as she's better than either of us.
I have taught him some Green Stuff use (I'm a way better sculptor than I am a painter), and he's made a cybork claw for one of his Ork Boyz. I had him start out with plasticine first, to get some practise. The claw doesn't look like I'd want it to look if it were my model, but it's how he wanted it, so that's fine.
Next big project is 10 cybork pirate-themed Flash Gitz for his birthday -- my wife & I have about 4 weeks to convert & paint them, so we're gonna be busy! We have 5
AOBR Nobz, a Nobz boxed set, a couple of extra cybork bits, and 5 of the new Pirate Ork Heads that were advertised here recently, and a lot of Green Stuff... I hope to post pics soon.