I just bought a super-interesting tutorial by Oxan - Studio - Member Yohann Schepacz. Actually by now I own all of their tutorials and to me, they are some of the best that are out there.
You can find them on their "How we work" page. What I love about his tutorials is that he loves to paint. No 3D, no or not much photo-bashing, just looking up good reference, working out a good composition and going at it. He is very honest about the industry and his process and I already learned a lot from him. So he is my artist of the week.
Check out his Artstation to get more cool images like the following: