It is nice but here are some things to make it better!
1. Your front door would look nicer with some white trimmings.
2. It would have looked better if the building above the garage was the same length width and depth but you still added the little ramp.
3. Instead of the dormer being brown (the window in the roof) it could of been like the color scheme on the house, blue and white.
4.On the inside it looks like there is a section of the downstairs where it has been cut back, but above it has not been cut back, either make it larger and put a support beam or cut it back as well.
But it is very good :)