Hi!
I've just uploaded in the post below a step-by-step tutorial about painting the helmet of a Thousand Sons Rubric Marine.
I always really liked this legion's esthetic, but I'm pretty busy so I decided that I will at least paint a helmet of one of them (I'm also assembling a miniature as well, but I will work on it later) to have fun with them, and to try out the Ultramarine paint from Rogue Hobbies paint set.
I hope you like how it looks like!
Regards
Flameon