I think this is what he was referring to:
We've got a vase/grail like object, yet we get the impression that there are silhouettes of two people even though that means the vase is not a vase at all.
And there is no spoon.. ehm.. box.
I could elaborate, but I'm not going to feed an off topic discussion.
As for the sketch, there's not much here to crit at the moment. His nose connects with his forehead, but that's about it. All I can say is it would make for an interesing style to try out on a larger peace.
I'll wait until theres more on the 'dup'.