Thank you for playing!
I guess I made map clues too obscure, my friend had a hard time finding treasure too.
Here is a spoiler/tip for future players:
there two clues eye and shovel-with-rope. Eye means you have to stand at 2nd figure and dig in the direction of the 3rd figure. shovel-with-rope means you have to dig between 2nd and 3rd figures.
1st figure is there only to help you find other two faster :)