You could probably get around 10k-15k from the right buyer. Maybe even more. Art really can't be priced. Someone may really like the set, and some may not. Ask for them to offer first and then haggle.
On the side note, I feel as though the set is left too minimalistic. There are too many blank spaces, like on the hands and feet. Even if you just drew orange lines to form a visible hand it would be better.
As for the rest of the set, I can't really see it in these pictures.