September 23, 2012 8:57:17 AM PDT
I love the pen drawings! They have so much more vitality and life. Definitely prefer them to the pencil drawings!
When it comes to doing observational drawings, you could draw a box and try and capture the scene within it. It helps think about layout, and helps change scenes in life into layouts/backgrounds for animation/illustrations.
You should also check out the 'Drawn to Life' series by Walt Stanchfield. There a compendium of all of his lecture notes that he gave to his students over the years. They are a gold mine for sketching hints and tips!
They're rather cheap on Amazon if you buy them used! Link here
Hope I've helped somewhat :).
Keep up the awesome work, look forward to seeing more of your sketches!