I have two recommendations.
First there is Alex Ries, an Australian artist who specifies in science fiction. He has done book covers but also works on his personalized franchise, centered around the Birrin, an alien race with a well-written lore and culture. Here is a link to his website (http://www.alexries.com/) and DeviantArt (http://abiogenisis.deviantart.com/).
Second I recommend Wayne Barlowe. He was the art director for many films including Hellboy, Harry Potter and Avatar. He draws his paintings first and writes novels for them second. He has two novel series: Expedition, published in 1990, that revolves around humans exploring alien wildlife on planet Darwin IV; and Hell, written in 1998, about its namesake. His art styles are truely unique and original. I have found no other artist come close to his diversity. Here's a link to his word-press (https://waynebarlowe.wordpress.com/)
I hope you have a happy birthday and a happy new year.