Since you asked.. I'm gonna write my first critique evar ;w; (I'm gonna be fair)
-I would say you did a prettey good job. The paws look good, a nice style. The ears are just a triangle, it's a good shape but would look better with an extra line. The mane looks gel'd, I suggest you do a little-bit longer stripes of hair insted of one blob. (Looks cuter that way too) Nose is missing, but that's a good thing, gives the peice a fun look. The necklace around the neck and tail is awesome -I don't think the eyes look good, the size is fine, the cat just looks a bit 'blind' since there is not white bit in them. I would add more sparkles to make it look better ^-^ -The colours fit perfectly, the backgound could be a bit less transparent thou.
-Overall the style is prettey un-original, many people draw this way. But it looks very cute, and you did this with a mouse which it prettey impressive.
-Over time you should try adapting this style to make it look more oiginal and simply better. Try adding more detail and shading C: And make the cat stand out infront of the backgound.