Your picture is kinda small. I would say the haloing is something that many people will hit you for from the get go. Other thing is that its a very odd size and needs more photo real estate in the image. Its cropped in way to much. The colors are not bad I think it could be better if it was bigger and showed more of the church and maybe a different angle instead of straight on. Like a worms eye view. From what I can see the textures look pretty good. I think you could bump of the white value more to bring out the clouds in the background.
Keep it up...!