Thoe flip-blending usually look a little queer, it looks ok here... but not more than ok that is... If you're going for a "flip-blend", be sure to make a lot of variations... Additionally you didn't give much fun stuff for the sides to blend... notice you gave the person to the right EXACTLY the same thing you were given yourself? Try to put the content of your tile a little off - in this case, you could have placed the white thing with it's borders slightly overlapping the edge of the tile.. This way, it'll be fun to see what the next artist makes of it...

Oh, and by the way, just tell me if you want me to shut up with my advice/pointers... =)