its not a big hero 6 sketch, but it should have been

some really early baymax sketches from big hero 6

from Wreck-it Ralph- a troopship from a weirdly medieval phase of hero's duty design

early gogo sketch showing her jumping thru extremely small openings

from bighero6, a honeylemon purse design that turns into a rocket launcher

early tadashi sketch as part of the original big hero 6 superhero team

sketch of gogo's personal bike, from bighero6

early version of baymax. its really just a paintup of a Shiyoon line drawing that they wanted rendered out

big hero 6 robot fighter designs (also draw over of model with lady graphics)

even more early Gogo Tomago designs- these are from a period where they were supposed to look retro

baymax detail drawings

Wasabi's van runner-ups- the car was supposed to be an incredibly boring vehicle that no person should really want to buy- these are the runner ups

tree designs for Tangled chase in forest

early gogo from big hero 6

wall robot from Fred's mansion

early wasabi sketch from before he had arm blades

early wasabi sketches from Big Hero 6

wasabi's glove design in earlier form

wasabi's glove in final form

honeylemon and gogo early visdev pieces from big hero 6

Wreck-it Ralph calhoun armor, from very heavy to very light. I'm sure I showed one of these before, but it's the first time I found the other two

from Big Hero 6, Wasabi's van and a timeline of van damage

early Gogo from Big Hero 6

Baymax poses with visible skeleton from Big Hero 6

This is really just a paint over of a Shiyoon drawing, so most all of the credit goes to him.  The illustration that is meant to show how the skeletal structure might look in Baymax when he is moving.

early gogo from Big Hero 6

honeylemon purse design and honeylemon sketch from Big Hero 6