Your stuff is pretty good, how long have you been drawing? Coloring was done done pretty well on your Zim drawing, although the design itself looked kind of unoriginal. Fan art itself is derivative, but I don't know, maybe give it more a personal flare. Like make a portrait of all the main characters of the show in a rock band or something, I dunno, I'm not saying you SHOULD do this, I was just brain storming. I mean all of this in no form of offense, it's just my opinion. Besides, you really don't have to listen to anything I'm saying here considering I don't really go with fan art a lot of the time and I haven't really taken an art class since I was 13 XD.
As for your poetry, you have a nice simple style. Nothing too full of mixed messages or weirdly structured sentences. I like simplicity. Four Riders was interesting. Don't be Emo was pretty good as well.
Just keep it up and you will be t3h greAt!!!
P.S. Double (or more) posting is allowed in Fan Corner as long as it's not blatant spamming.