I haven’t found any inside pictures handy, but essentially we put R20 Rockwool insulation in the walls, and R40 in the ceiling. I used Rockwool as I knew it would moist and didn’t want mold.
Once the vapour barrier was on I sheeting the inside with 3/8 OSB and sprayed everything white.
OSB isn’t much more expensive than drywall, is super easy to work with and just used a sheeting stapler to put it on. Certainly looks good in a garage or shop, and has the major advantage of being much more durable if you run into a wall with something you don’t immediately get a hole. It also means mounting things is really easy. I would never build a shop with drywall again.