They were artistic depictions of persons, places and things. Some of those persons were good; others were scoundrels. Cartoon characters are also depictions of persons. We can debate the artistic preferences of representational art versus impressionistic art versus "cartoon" art, but I see no qualitative difference among the various forms.
The Bible is quite silent on art. The second commandment appears to proscribe sculpture; but then at other times men were commanded to make sculpture (the bronze snake, the cherubs over the ark of the covenant). Some interpret the 2nd commandment as forbidding all representational art including photographs, but this position is taken by only a small minority. I see no guidance in the Bible on caricatural art.
Adventists tend to eschew permanent displays of representational art in the churches (i.e. no crosses), but other religious art (felts, photos, illustrations for books) has long been part of our tradition. The most widely circulated edition of Steps to Christ from my youth had cover art depicting an image of Jesus standing next to the UN office tower in Manhattan.
When it comes to art, be it visual or auditory (i.e. music), I see no Biblical texts extolling the virtue of hymns over the "praise chorus" nor do I see any Biblical texts favouring one form of visual art over another.