The black outlines on the smiling thing bug me, but since It's a concept I won't go too deep on that.
Just another thing for future reference, try not to use MS paint default circles (or default colors for that matter, you used at least 3 shades I can recognize on MS paint) for any reason, if you really want something decent try to draw it from scratch. Won't kill you to try even if you are using a mouse. I mean the whole thing looks like you used a tad too much (notably the eyes, but I noticed that half of the body is the same as well)
Just another thing for future reference, try not to use MS paint default circles (or default colors for that matter, you used at least 3 shades I can recognize on MS paint) for any reason, if you really want something decent try to draw it from scratch. Won't kill you to try even if you are using a mouse. I mean the whole thing looks like you used a tad too much (notably the eyes, but I noticed that half of the body is the same as well)