For the first mock, I thought of the idea of combining the brain and speech bubble together to create a mark and instead of a full watercolour texture, I used gradients and overlayed the colour to give it an illusion of watercolours.
For the second proposal, I illustrated a human head with a brain exploding in paint to symbolise the creative mind and a hand cradling the brain as to symbolise healing to give it a wholesome and empowering feel.