What are these bacteria on agar from an 8-year-old kid's palm?

Factual Questions
1

See subject. It’s a cool photo.

These growths occur in a standard/default preparation of agar, right? Which is what? And deposited under certain delimited environmental conditions?

2

I can’t parse most of your OP, but I see Serratia marcescens growing.

3

The yellow circles are most likely staphylococcus aureus

4

The photo was originally posted here. Some close ups 1 2.

Author says the big white blob is probably Bacillus. The other white is Staph, and the yellow and orange bits are most likely yeast.

There’s also a description of the agar solution and procedure she used.

5

Thanks!

6

Blue infinity could.

7

If it’s from the palm of an eight year old, there’s probably something there that’s suitable for bacteriological warfare…