The Archaeological Survey of Co. Louth has a nice photo of some rock art here but I dont think I found the panel that was illustrated. The large outcropping here has been partly bulldozed in the not too distant past, hopefully the best of the rock art did not dissapear with it.
I did manage to find a single cup and ring at the western end of the outcrop, with some possible cup marks beside which are somewhat dubious. The outcrop is very overgrown so there could be lots more underneath.