Artwork Archive is built to grow with you and your career. You can upgrade your account at any time.
Go to your account settings. You can find this either in the left-hand menu under 'Account', or by clicking your profile image in the upper right-hand corner and select 'Account'.
Click Upgrade Now on the plan of your choice and it will go into effect immediately.
Your previous payment will be applied toward your new plan and your plan will be prorated for the remainder of the year.