I really like the coloring of the HM stamp - it is extremely well done!!! To me, the background floral paper just didn't seem to work with the image. Maybe try using a brighter, more cheerful paper?? Also, I might try layering the image on a coordinating cardstock, and put some embellies in the corners. That's my opinion, though - all in all, I think you have a great card!!! HM stamps are too cute!!!
My mind works like lightning - one brilliant 'FLASH' and it's gone!