That Superman is super. What a dumb joke but I had to say it. Anyway for sketches they are really well done. I like the 2nd pic, very funny. My favorite so far is Superman, followed really close by BW Megatron. Are you gonna finish these?
Great Doodles. Now the question is what class were you doodling in? I use to doodle all the time in french class back in highschool ... then I wised up dropped it and started taking art classes.
* character & object design * storyboarding doodled at "OK-I'll-let-u-guys-work-on-ur-assign" time XD