This postcard reflects the original weird dimensions of the painting -- measuring in at 7.5" x 3.75". Because of this the card requires first class postage (not postcard postage).
But dude, it's not like you have postcard stamps anyway, right? I don't even have postcard stamps right now and I am a postcard NUT. I can't ever seem to make it over to the post office, and lately my post office has been filled with people mailing stuff. So I buy forever stamps at the ATM instead. Because I am lazy. And because I want to send postcards more than I want to wait for stamps. Besides if you're sending them oversees you'd need additional postcards anyway.