I agree I love the way it looks now... the pops of purple really pop. But if you feel it needs something maybe word art ???
Maybe just a flick of your paint brush with a bit of wet ink on it to create a spatter? Depends if you want to mark that pretty postcard or not!
or you could use your fingertip to smudge in a dab of purple paint here and there on the postcard to follow the other colour accent and make it less uniform?
If you decide to add to it, you could def continue the border pattern you've created, unless you meant for those sections to symbolize the seats around the table. Then I would leave those as is!
