Digital painting has become a favorite hobby of mine.
One that has exponentially increased my skills as a Photoshop artist and graphic designer all around. It has given me the confidence to make edits on photographs that I thought were impossible before. Now if I can't find something I want through a stock image service or if I need to make a significant change to a photo, then I just paint it in.
Learning the fundamentals of art and design (lighting, color theory, composition, perspective, balance, storytelling) through painting is arguably one of the greatest skills I picked up in my career as a designer.
I am constantly trying to improve my craft and I've found that doing so through digital painting is one of the most enjoyable methods to do so.