Is my drawing of my invader any good?

Truthfully I don't see any thing wrong with the drawing and find it pretty good, all I would suggest however is that you continue drawing it and edit it every so often, maybe look at other Irkens and compare to them, don't exactly copy it, but use it as a base design idea before drawing the Irken more, but I think it is fine and would suggest you continue drawing it or other things as well, but I would like to see more of this Irken. I think the green is fine, maybe a litte lighter would be better but it is good to me, as a drawer myself I know if you continue it will be much better then it aready is. - Acidfish

My first drawings of invader zim were hideous (not saying yours is!) and it took me about a year to perfect my drawings. All I am saying is that's not too bad for a beginner, and if you practice even more then you would be able to draw really well.

Not bad, but I'd suggest using non-lined paper, and markers would be ideal, as opposed to colored pencil.

'least it looks like it's from the show...mine r like human....

Not bad. I used to trace a lot until I got better at drawing