I still very much like the Lara trampling Trex!
The pictures you used of Diablo... hmmm...
I know that it is hard to create your own drawings. And it will probably also look very rough when you start out as an artist, but in all honesty, I think you are hindering your own advancing if you use crop-outs like those. First, we have all seen those pictures before in their natural shape, so it is nothing new. Second, puzzling together images like that leads to a lot of repair damage like missing pixels or off-colours. Third, you don't get to show off your own ideas because you are limited to what other people have drawn before.
Let pictures of other artists inspire you, use them as references if you want - but do your own thing! The results might not be comparable to those of more experienced artists, but it is the only way you get to develope creativity of your own.
Just look at people like RavenClaw or Drethenzai. They both arrived at LD5, picked up then pencil and became pretty damn good very quickly!