This is kind of boring, but when I was a kid I fell in love with impressionism, particularly Monet. I had a little postcard booklet of his works that I would flip through all the time. Later I found Henri Toulouse Lautrec's works which also inspired me a lot. Even though it doesn't always show, impressionists and post-impressionists are a huge influence for me. I still reference their work today.
Later I became really inspired by comics/manga. I have too many inspirations to count but I love certain American comic cover artists like Adam Hughes. I also love classic shoujo and shounen jump manga (too many artists to mention them all). Additionally, I take inspiration from experimental manga artists with unique styles and techniques like Nakamura Asumiko and Suehiro Maruo. I don't know why but comics have influenced me more than pretty much any other modern media.
Oh! Duh! I forgot to say I literally started drawing because of Sailor Moon. So there's that.
I also have a lot of indie artist inspirations but they change every couple of years or so. Right now I don't have anyone in particular, maybe Dr. Moricky. I just love the fuzzy, dreamy aspect of their work. I've been taking notes. Like literally.... trying to pick apart what they are doing exactly and how effective it is.