The character look great, but the heavy dithering ruins the piece, and the tiles are kinda irrelevant.
Here a partial edit to show you how you could fix these issues (i tried to play with the bg to suggest a heart , it's a possible idea that you could work with to improve your concept).
Cute! I like the lines; a lot of personality in the faces. The dithering is overkill, though. Also, maybe a warm background? The blue doesn't seem to fit the love theme very well.