Lance, automatic writing and drawing are well known and they are not paranormal. They do not involve spirits. They do not qualify for the million dollar challenge.
If you are in fact drawing with the aid of spirits, that is potentially paranormal. You have to define something that you can do with the aid of the spirits.
Examples: You leave the room, the spirit is shown a card with a number between 1 and 10. You reenter the room and ask the spirit to draw the number you just saw.
If you can see a number in the details, then that qualifies. You simply would tell the testers what number the spirit has drawn.
The testers prepare a set of 10 drawings: a face, a car, a dog, etc. You are shown all ten drawings. One drawing is chosen at random--you are not shown which one. The spirit makes a copy of the chosen drawing. You pick which drawing you have copied.
Do you think you can do something like this? If not, I suggest you ask yourself why you think spirits are involved at all.