It's simple yet done in such a way that it looks elegant.
Upon closer examination, some parts just look downright odd. The fencing that encloses the base of the roof looks odd, especially those weird upward extensions that occasionally block them out. You can see that the fencing on the exact roof didn't fit, and the 1x2s you threw in look out of place and could have been fixed by building a fence as opposed to using the bricks. It's mostly just the fine detail that could use some fixes though, as the overall shape is very well constructed.
Tip: To avoid having to oversize the support for umbrellas, change the umbrella from an even amount of bricks across to an odd amount of bricks across. That way you'll have a center where you can throw in something small (x1) like a polebrick so as it won't look so odd.
I like it. 8/10