I tried to comment and mark with hashtags but the system wouldn't take them. This is how it should read.
In the second blotch in from the left, mid-picture, in the centre there is an almost perfect cross, a bit like X marks the spot, only more upright like a cross rather than an X. I tried to mark it as an interesting feature, but because it is within a blotch the star mark wouldn't take. I have starred it next to it.
The other stars are all boulders.