You can sell the work created by you. Normally with my other art prints and my own final work, you care not allowed to resell it. You are also not allowed to edit it and then sell it. BUT with the colouring plates you are allowed to sell our combined work. You are free to rework, edit and adjust it and then find someone who loves it and sell it to them!
You are not allowed to multiply or copy the sketch, and you can’t multiply or copy the final collaborative work. But this single collaborative work may be sold as unique art piece. If you want to make a second work with together with me, you can buy another colouring plate and work your magic again and sell this new work too.