Sketch of the Week: Tree

I was going through some old sketchbooks the other day when I found this unfinished drawing:

I believe this is an old tree out at Cahoon Park, overlooking the sunken garden. I'm not sure why I never finished it. I suspect it was either because it got dark, mosquitoes attacked me, or both. It's a cool tree though, gnarled and weathered, so I might go back and have another shot at it some time.