When you are playing Ifan and you meet the skeleton trader he gives you a small looking glass. You can use this to summon him at any time and to anywhere.
Every time he complains "no, no don't call me, you will never see your son alive" and so on. It is a lie - you can summon him whenever you want. Bug? Probably not.
Obviously you can then dump (sell) the 150kg paintings on him as one of the more obvious cheats is to sell stuff to the vendor you will kill first (Griff's lot) so summoning him there to pick up all the paintings helps as you can't move.
