Ey, your art is nice (in our eyes), nothing particularly wrong. It's nice and simple is all, and more often than not, clean in artwork to understand fully. In fact, you did make that self potrait, soooo.....YOU HAVE ARTED *bricked*
However, otherwise than that one potrait, nothing else gas been seriously detailed or it's a bit...well, similar to eachother in a sense. Give it some shazam! No, don't stick in Shazam, just make it stick out.