I like this. I really do. Here's what I think.
My eye is searching for a pure white on the light house. I'm looking for the highlights. and then in turn I'm looking for a few startling darks. I think that would spice up an already great painting. You might also want to darken the shadow side of the top of the light house. If you give a good squint at the picture you've posted here you see that the shadow edge of the body of the light house seems to form a solid dark line...but we don't see that same dark area a the top of the light house and it's roof.
I don't mind if your lighthouse leans a little. It wouldn't be the first leaning structure I've seen. I like the background. It took me a bit to notice the bridge and I think that's a good thing. You aren't pulling my attention away from the focul point, but you are still pulling my eye around the painting.
Other than the few things I mentioned above I really can't think of anything else that bothers me with this piece. It has a lovely painterly quality and I like it very much.
