A couple of years ago I found this app called SKTCHY. I don't think I realized how much I loved to draw until I started using it. It's great for practice and experimenting with different medium and style.I'll be posting a lot of my SKTCHY illustrations on here.
If you're an artist, (or even if you're not) try it out. You'll learn to love it. And you might get some great portraits of yourself out of it.