Figure 4 and 5 on the Moelv rock are missing some parts due to damage to the rock, and I did a restoration for what the missing parts might have looked like:
The abstract patterns within figure 4 and 5 are quite common in petroglyph animal figures. What the artists had in mind when adding these varying patterns within the figures up for interpretation. Sometimes it look like the inner patterns might represent the organs of the animals, but these patterns can differ a lot between the figures even when seemingly it seemingly is the same artist carving figures of the same type of animals. It has been suggested that the patterns reflect what shamans saw during hallucinatory states. And another possibility is that the patterns are inspired by psychedelic visions induced by fungi containing psilocybin.
Norval Morrisseau was an Indigenous Canadian artist whose artwork has some resemblance to rock art. I did a coloration of figure 4 and 5 inspired by his paintings for further exploration of what the creator of the petroglyphs might have envisioned: