I ran into a seller online who had a bunch of these, similar type sketches. I was intrigued at first, but the seller's demeanor caused me to run in the opposite direction.
hi, im not sure, just a fan who want to collects this stuff too. But for what i have seen, i dont think its real, specially beacuase of the sketch. MJ was an excellent drawer, artist (sorry im from ARgentina), and it looks very poor, and the lines shakes as if there was no precision. Also the colour choice seems weird, and MJ had a great aesthetic taste.