^ What cf said. Man, what an improvement. I'm, honestly, awestricken with that improvement. And especially on a tablet. Great use of multiple layers and sketching, as well. The only suggestions I can really make is to 1) keep up the practice, it's showing and 2) maybe sketch with some thinner lines. It will give you more sketch space without crowding the area, and give you many more lines, which, for me, lets me get a good look at multiple positions of them and pick the best one. Just my opinion though.
Speaking of OpenCanvas (ver1.1) there seems to be really old (but free) version of the program here:
http://www.flat2d.com/opencanvas_en.aspx (Under 1MB!)
Don't bump old threads. The op hasn't posted in like a year.