I like the eyes and the simple background but there are some problems I see. There are a couple of blinking stray pixels (above each eye) and the roughness of the lip looks like it could use some work. When I first saw this, I thought that there was a bat flying around in the background that suddenly pops but upon looking closer i see that it is a heart (right?).
I hope you can see what I mean and post an updated version. I really like your style and would like to see you improve!
Thanks for the tip :D
I totally didn't notice that about the eye! I'll see if I can fix it soon~