The tombstones in the foreground seem rather much larger than they should, some more foreground vegetation, contrast, and/or detail on the tombstones could fix that. The white parts of the image on the building could some more detail as well. Aside from those two criticisms this is a great image, some good digital art there. Another suggestion is that it would be a neat trick might be to animate the image some, have the grass sway and animate the rain fall. Though over all this is a very good piece of pixel art, looks straight out of an NES game. If you're going for game design this is a great start for pixel art for indie development.