Arthur Haas is a concept artist and illustrator living and working in the Netherlands. His website, which is essentially a front door for his blog, is light on biographical information, but has lots of his fascinating images.
Haas incorporates a multitude of imaginative freeform shapes into his compositions, both in the alien-looking environments and the range of unusual craft that fly through their often murky atmospheres.
Haas frequently renders his works in limited, almost monochromatic palettes, pulling a sensation of vibrant color out of contrasts in value and chroma. I like in particular the way he creates depth with multiple planes of atmospheric perspective.
His recent work is largely digital, but as you go through his archives, you will find work done in traditional media like acrylic and gouache.