Looks pretty good for a first try..
Here's a tip, I noticed on the posts on the side of your house, you have them rounded on the outside, but they are straight down on the inside of the post. It would look a lot better to just have them rounded out, and you could do it with one tile instead of needing two, which saves space.
Also, your roof should have a view of the back area, since rpgs like graal are at a 3/4th view, not from the side, you would see some of the back part of the roof. (most people forget that it's at this view) Just gives it more depth and stuff.
Oh, and your bricks and stuff look a little fuzzy, you might wanna use more bold detail to bring out the detailing more. (I have never seen fuzzy blue bricks except on the disney channel)
