If you submit your contact information to the Subscribe form or the Contact Us form, your information will be stored on the Wix.com servers and probably in a spreadsheet on my computer. I will not share your information with anyone else. Eventually I will add your contact information to an email platform like Mailchimp.
When you use the shopping cart to purchase cards or prints, you are entering into Fine Art America territory and pixel.com territory. You may enjoy their privacy policies at https://fineartamerica.com/termsofuse.html?document=privacypolicy and https://pixels.com/termsofuse.html?document=privacypolicy