Sounds like you might want to do it right before leaving the park if you don’t like to carry stuff around
Similar to the animation class that ran at Disney’s Hollywood Studios for many years, there is now an animation drawing class at Conservation Station. Currently, there are classes offered nine times per day. It’s included with admission and there are no reservations. We saw Simba, Ed the hyena, and Rafiki classes during our visit; the characters vary throughout the day. During the class, every participant is given a clipboard lap desk to use. Instruction is on projectors at the front of the room, led by a cast member. The adults and children in our party all loved the classes and already have plans to go back.
You can buy a frame nearby for $39.99, but otherwise you’ll just have to carry your paper with you.