Hand and dot and line motifs are a far cry from the extraordinary animal painting etc going back to around 44,000 yrs or so that have no evident Neanderthal links. Of course, a lot of anything of this nature is hard to pin down. But at one phase, namely overlapping my formal education years, I did do a lot of direct paleoanthropology research myself, so have a decent idea how these things work. Plus, like that link itself stated, cave motifs tended to get painted over or receive added content over tens of thousands of years, so it doesn't mean it was all painted at the same time or even by the same people. Neanderthals weren't dumb by any means, but they were quite different in how they obtained and used materials, more locally than through trade connections. Smaller less mobile populations apparently. But they certainly were far more highly evolved and intelligent than the typical tagger or "street artist" around here.