I'm kinda keen to explore the circle idea a bit more... just a few notes: - it needs to be spelled 'on the rocks' - currently it looks like a speech bubble, which I'm not a big fan of - the climber itself looks very good!
Maybe some texture on the rocks and maybe even the letters would give it a whole other dimension... Also, if you could try and make the climber more dynamic by eg. bending the top leg a bit more