My first two digital drawing. Absurdity included.

I'm a member of a forum that runs a little thread about practicing ones drawing-skills. They give you a new "title" that you're supposed to draw a picture too every 48 hour and I've decided that all my drawing should be pony-related, therefor I've ended up with a pair of... decent images.

These are all made using a mouse btw, probably going to get me one of them Wacom's at some point, but for now my mouse will do.

This is the first one, where the title was "Violet brick with hat", and I ended up with this. I'm fairly happy with it, but the lines arn't smooth (and the drawing isn't vectorized) http://i.imgur.com/Utoze.png

This is the second and most recent one, the title was "Post-it travels across the Atlantic Ocean". http://i.imgur.com/31rSL.png I'm quite happy with this one, as it's fully vectorized and I didn't follow any images or anything to draw the pony :)

But as always, I would really like to get some feedback on these! How can I improve, what should I learn and do anyone (anypony) got any interesting tutorials that I should look at?

Best regards! Mrtn