Nice start! Your drawings have some really cool shapes and gestures! I like the look you're going for but zipfelzeus is right, you need to do some proportion and anatomy studying and really tie down your drawings. You don't seem to understand how breasts hang from the female torso and your deltoids are another major problem. The issues in your upper body anatomy are the most noticeable, but you're not even drawing the lower body so that probably needs a lot of studying too.
There's a lot to learn, but don't let that stop you from having fun. I think seeing this style in a more accurate and drawn out version would be really interesting. Welcome to CA, Keep posting!
@zipfelzeus, thanks for the feedback i can see what you mean, i've been drawing for a long time but i am relatively new to figures so your comment is really helpful!
@vertical, thanks for the comments, i can see what you mean about the breasts and deltoids i'll try sort these issues out. The rough nature of the sketches is mainly because im still getting used to a wacom, i'll post some pencil and pen sketches soon!
@raminafshari, thanks! i'll have a look at adding better shadows to future sketches!
Thanks for the comments on my sketchbook! You are on to a good start here, keep going with the anatomy and gesture work they will pay dividends. If you've not already discovered him, try reading Loomis books on figure drawing (actually read all his books, they are gold dust), they are out of print now and free to download here: http://acid.noobgrinder.com/Loomis/
With regards to improving that last environment, here are a couple things to consider:
1. Establish your foreground, middle ground and background more clearly. At the moment the middle ground is not clear - whats the glowing pond/portal sitting on?
2. Atmospheric perspective is key to establishing depth. Basically this means dark (black) values/contrast recedes with distance. Your middle ground and foreground are competing with each other at the moment (i.e. the darkness of the grey and the trees are quite similar) making it look flat. Try making the closest trees etc darker in value, middle ground in the middle and far trees lighter. I'd also add some more trees (or something) even in lighter in value beyond the ones you already have.
I really really love your traditional work - your shading is immaculate (and sooo so soft).
As far as the digital artwork is concerned, your drawings are excellent but my only bit of advice would be to use hard brushes rather than soft ones. Soft brushes tend to make the piece lack in a dynamic quality. Just my opinion, though!