For the longest time I’ve been a huge lover of the artwork of William Gibbons, aka
ashwara. His style is heavily influenced by traditional ink paintings and some of his older work is actually hand-painted with ink brushes, but he uses digital color to really hammer home some gorgeous colors. That combined with his character designs (which seem styled somewhere between japanese and western cartoons) make for really arresting pieces of digital art.
I recommend taking some time to read through
Para-Ten, a short graphic novel/webcomic he made. This comic probably shows off his ink-brush influence best out of all his work.