I have just discovered that my fine art print order buttons on the website aren’t working with PayPal at the moment.  Apologies if this has caused you a problem.  To get round the problem I’m upgrading to custom PayPal buttons, as shown here for Swirling Leaves.  Unfortunately I’ll need to update each one individually which may take a few days, so in the meantime if the page you want hasn’t got a PayPal style button please let me know!