I found a great place to build my skills. it is called Sketch-o-Holics check it out. They have a topic and a certain amount of time to do it in. it's a lot of fun, I've learned a great deal just in the 3 drawings I've submitted. Someone actually voted for one of my submissions, I was on top of the world, only one vote, but it was a vote : ) this is my entry into Horns.
done in Sketchbook Pro on an iPad.