wow awesome title. I'm glad you joined us.
For a first time user of a pen tablet, I say you're pretty good.
Also you seem to already have the whole picture in your head, even complete with details and backgrounds.
I like all your attempts in coloring.
For you, I think the best way to start is get a good grip of your medium. Maybe practice a lot of quick sketches of faces, poses, etc (just anything really) to release the tension in your lines. Its still a bit fuzzy, which (imo) indicates restricted strokes. Do you make multiple strokes instead of a single solid one when making a line? If yes, you may also want to try incorporating a larger movement with your wrist and possibly the rest of your arm... i really can't explain it but i hope you get the picture.
that's all for now. I will critique your art in depth when i see some sketches.
Its nice having you around. You're quite an interesting fella.