Short answer: It depends on if your commission has a guaranteed delivery date and whether that date has passed.
If the guaranteed delivery date hasn’t passed yet, all refunds are based on your artists’ cancellation policy. Contact them directly to discuss ASAP.
If a guaranteed delivery date was set and has passed, you are entitled to a no-fault cancellation. This means you will get a full refund if you cancel your commission.
However, if the guaranteed delivery date hasn’t passed yet, all refunds are at your artists' sole discretion. Be sure to review their cancellation policy in their ToS and contact them to discuss ASAP.
All refunds must be initiated by your artist. If you’d like to initiate a refund, please refer to their Terms of Service and contact them to discuss your individual circumstance.