Nana-- here's a couple of things I saw. please the next picture take the shovel out of it, I think we're missing some info. Now the rock farthest up and to the left is asquared rock or heeart shaped can't tell, but it has signs (good) on the right side of it. also, it has a"V" cut out in center of edge behind the weeds. If you turn the picture upside down you'll see a face I outlined look at the original the same way and you can see the grayish part of an eye and a black circle. It's like wearing helmet and only seeing the eye. You have a nose and mouth also.
OH, I almost forgot, those little dents--- some are in a heart shape, otheres diamond. You'll need a magnifying glass, but look at each one closely. some have markings in them and the only way is with a Mag. glass. those rocks were put in that shape for some reason. Notice the triangle I have marked. it has 4 dots (if I remembered right) see if these rocks you have are in the same position?? oNe looks like a heart,
Jacko