Thanks for the feedback, hope this clears things up:
Rights
Private means the artist retains the full copyright to your image. The buyer may display the art as part of their collection or resell it on the secondary market.
Full Commercial means the artist is granting the full commercial rights to the art. This means the buyer can do whatever they like with the image for profit. That could include using it on a commercial website, using it on printed merch etc. You may want to consider possible uses for your work and print editions accordingly. Depending on what type of art it is the buyer may or may not want to purchase commercial rights if there are multiple editions available as they will not be given exclusive rights, we leave this fully to the artists discretion!