It looks like they were going for cellular scale, which would explain the absence of icosahedral shapes as viruses would be way too small at this scale. However, some parts look like colonies rather than cells.

Most cells would not be this colorful unless stained or grown on media that colors them.

Hard to say what specifically they were trying to portray. MRSA and Strep look represented, still looking for Candida auris. Maybe some cyanobacteria?

To tell friend from foe would require more than looking at them--DNA sequencing, drug resistance assay, etc.

Definitely not mine, I have no talents. I just found it lying around on the internet

Probably not intentionally - e.g. I don't see any icosahedral shapes representing viruses - but life does come in all shapes & sizes so it still works regardless! :-P