Ooh good question! I think there are many artists out there that I find very exciting, and I suppose anything you like ends up inspiring at some point.
Yes, as Nick says, a great question! The funny thing is that you can go through so many periods of inspiring art and artists. When I first started doing abstract art as a child it was people like John Marin, Franz Marc, Kandinsky and some other artists that did a sort of representational abstraction.
Then I went toward people that more thoroughly rejected representation or took greater liberties with it, people like Picasso, Matisse, the Abstract Expressionists. Both Picasso and Matisse influenced me as well I think just as examples of tremendous creativity, in line, color, composition, subject matter.
When I was in college I also studied a lot of art history and during that time people like Giotto, Piero della Francesca, as well as the Impressionists, who I'd never liked before because they seemed too pretty, and Degas and Gauguin, and in America Marsden Hartley and Arthur Dove.
Probably my last abstract influences before I turned to representation were people like Stuart Davis, Fernand Leger and maybe Mondrian. I loved the bold, jazzy feel of their paintings.
And yet all along I've loved quiet but seemingly honest painters like Chardin, and Fabritius(?), a sort of humble straightforward representation, but not a highly fiddled realism.
For me the oddest thing, especially here, is that I'm really new to bird and wildlife art. So I keep discovering wildlife artists I'd never heard of. That has been a great revelation. Two other artists that I forgot about, especially in their watercolors, are Winslow Homer and John Constable. My guess is that more than any other artists they have an influence on my newer bird paintings.
And thanks to Nick for mentioning Paul Nash. Someone else to explore. I think I've heard the name before but I've never really looked at his paintings.
And I'm sure I've left out some people who had a huge affect somewhere along the line.