Bikes make great practice for nailing proportions in perspective. If it's off even a bit, it ends up looking funny. These designs are uninspired, but this sketch taught me alot.

Shoes in Sketchbook Pro. I'm practicing cleanliness of line, but trying to keep my speed up.

A Photoshop rendering of one of the shoe designs above

One of the first sketches after unboxing my Cintiq

I've been watching Scott Robertson's youtube channel. Hopefully it shows.

Photoshop rendering