Wow, this is awesome. I love the design, it fits in so well with the actual show. I seriously could see this Tea Shop there (except maybe without the the lettering, since ponies can't read English) Love it.
I really like this scene. It's a nice little time out from all the craziness that always seems to be going on in Ponyville.
It appears that Derpy is the only one drinking hot tea. The only thing that worries me is that I'm not sure how she can pick up the mug without spilling it on herself. Ponies always find a way, though, as evidenced by their ability to handle cider mugs.
Something about this picture amuses me, and I don't know why. Then when I was staring at it trying to figure it out, I suddenly imagined Twilight dumping her tea on Spike for no reason, like an older sister would do.