Hi there Tuesday!
Maybe some of the introductory Rock Art-icles make a nice start:
http://tinyurl.com/y69dnx
Cheers,
Jan

train usually but i'm feeling kilmartin - with all the other things there it seems that might be an amazing place to start.

this was partly prompted for me by the discussions of entoptic imagery (elsewhere) so I'm very interested to see if th eimagery of rock art cross into other decorative techniques - pottery and so on