Pics are so big I can't get all of one on my screen . What did catch my eye was pic #5 upper left quarter . Are those small carvings on the heart shaped rock ?
I couldn't really tell how big those rocks are,but It could be the front chainring of a mtn. bike riding up and over the rocks,we have some pretty big rocks here in the ground were the bikes are always hitting and making groves in the rock face.
Open each picture in Paint and use the resizing aid. Re-size them to about 500 x 500 pixels then use "Save". A message window will open and ask you if you want to "save" your changes and you click "yes". It'll put that new size back into the original folder. A 500 x 500 pixel photo is a good usable size for posting. It doesn't run out of the view field and can be zoomed up to a larger size for evaluating small details. That size loads a lot faster, too.
Plus, Marc would probably appreciate the slight savings in site storage space.