Looks like this polar bear didnt like the idea of carting around a cowboy on his back and got angry at the thought of being a beast of burden. Too bad he didnt know the cowboy didnt mean 'that' kind of ride!

I stole the sketch a day challenge rules from  Kinojaggernov so go check out her stuff!

Rules for KJ's 1/2 hour sketch a day challenge: (stolen from her upload)

1) The figure must be complete. No missing limbs.
2) No references. Imagined poses only. (EDIT: Unless you're doing a still-life or non-figure pose, then references are OK. I don't expect people to instantly remember what flowers or plants look like. The point of not using refs is to examine your work after you finish and see what you need to improve on next time. Remember, there's always tomorrow, don't stress out over it, just try and keep it in mind when you try again.)
3) After 1/2 an hour, unless the drawing is interrupted by RL, the work will be posted, even if it sucks and is embarrassing. This is a journey to continue improving as an artist, and I find that consistent posting to the public is a fantastic motivator to improve, because who wants to embarrass themselves, right?