I found these two links in this
CTRLPAINT.COM article - and yes - this VIDEO is also very important - first learn basics and fun if you are good in basics / later
http://androidjones.com/ very great artworks

and inspirations

But sorry, can't post example images from his great homepage
A second great artist is Noah Bradley
http://www.noahbradley.com/ also very great artworks, I did have also subscribed his mailing list, reference packs (yes Its good to have own references etc. but I dont have nice landscapes in my near)

maybe so I can get some nice references from NEW ZEELAND?
http://noahbradley.us2.list-manage2.com/subscribe?u=fd18221c4783fa74006d7efc9&id=0b613af62c

More very cool Artworks on his website

If I see this, I will made some APOPHYSIS STUFF AGAIN, Fractals I think have also very interesting structures for textures - hope so much, that we can have soon a new VERVE Version, with the possibilty for Image-Brushes/Stencils/Tubes

because his Clouds in picture one, are reminding me on a old APOPHYSIS ARTWORK from myself ...
my system: intel7 - 2600k, gtx 970, dualboot windows 7 64 bit / ubuntu 14.04 lts
my deviantartpage:
http://zeropainter.deviantart.com/gallerymy youtube channel: zeropainter - ok, there are only 2-3 very short videos