Mystifier, because you weren't able to guess the result and had to oblige to the rules of hanjie-solving you deem the puzzle "not great"? Excuse me for saying but I find that statement rather shortsighted.
'Mystifier', why do you need to be so insulting, just because you don't solve but 'assume'??? The challenge is the puzzle, even if it is not an picture at all. Why shouln't it be abstract?
I enjoyed it, because it was difficult and took me time. I challenge indeed!