In this first pencil sketch the cavegirl herself is rather fine; her fur bikini is nicely ragged and she has a reasonable spear. She is shapely without being ludicrously busty. The sabretooth is not so good. Firstly, it is far too big; much more than lion size, which is what smilodon was. Secondly the artist has used a tiger as his model, which is not uncommon, given that when I was small they were always referred to as sabre tooth tigers; however this nomenclature seems to have gone the way of Brontosaurus.
This picture is by an artist called Sandy Plunkett. Again the girls isn't really a cavegirl as she has metal bracelets but otherwise she is superb: a really nice, athletic figure and a great fur bikini. The sabretooth is dreadful, however, with a really badly drawn head (although the size is about right).
Next up we have another Frazetta with some really anachronistic flying reptiles. A good, animated sabretooth and a typically curvaceous girl.
Here we have another School of Frazetta picture with a metal sword armed warrior and an alien sabretooth. The girl is pretty strapping and has that dark and obvious look I like!
Another real Frazetta with a couple of very feral looking sabretooths and an even more feral girl. Her fur bikini is bursting under the strain and I wonder how she gets her hair to stay up like that. Maybe she rubs sabretooth semen into it as prehistoric hair gel.
Finally, yet another Frazetta. This girl also has a metal spear but she wins the prize for having the most minimalist bikini; just a few wisps of fur. Hope its warm where she lives!