Howdy!
Came across this listing. Some red flags were waving and I figured I would share them here. A) Why is the smaller painting more expensive? B) In the same way that you wouldn't buy a used car without having a mechanic give it complete check-up, don't buy art without having someone familiar with the artist's work authenticate it (complete with guarantee) and C) definitely meet the seller in person and face-to-face so that you can see if the paintings are damaged in any way.