Atwood, Bentley, Bernouli, cataract, Chia, DoctorDraca, endeavour, Fiery Gatoh,Graham,Jadeghost, Lacuna, Lilian Nightshade,Metallic Dragon, misneach, Orchid Sprig, PitchBlack, Pluma, Saikiyo, sketchi, Solloby, Vampiric, Verdana, and Yağmur!
Took Berky, Ethulai, Nadine and Solloby off because they don't have a staff pet yet or I can't find any evidence of them having one.
#staffpetartistanalysis
One-staff-pet-so-far artists...*note my theories are not based on any hints given because I'm am
way to lazy to look for every hint (and I can't remember them all*
Bentley:

A few lineart edits: eyes, added wings, tail, a little of the legs. Wisps around the head and
tri-coloured fluff. It seems like they stuck to the more darker parts of the palette. Not a lot
of patterns, more of brightly coloured patterns.
Theories:
-Lineart edit again?
-Darker side of the palette
endeavour:

They stuck to the lineart, so no edits. Simple marble look. And also used
two colours of the palette, mainly one though.
Theories:
Sticking to two or three colours from
the palette, but using one the most.
Not a lot of lineart edit (they may surprise us
because that was their first pet AND first staff
pet?? could be wrong and just a new user though)
Lacuna(I think someone already did it, but whatever):

PPS, fo sho. Simple lineart edits to the ears and tail. Not much patterns, but
the patterns are cute and simple.
Theories:
Probably won't be another PPS
Simple lineart edits
Simple and adorable patterns
misneach (again, someone may have done this already):

Stuck to the basic lineart of the pet, but did add an edit to the background.
Smooth stroke? from the eyes and faded outwards, replicated again on the
paws.
Theories:
More lineart edits, maybe
Simplistic designs