Hello Kate,
Well that’s a strange one…
Sorry to hear your first outing with AR didn’t go quite as you were hoping 
Looking at your posted image though, the colours, values and contrast all look fine here. (And that’s a really nice pet portrait too! Is he/she yours?)
What might help might be to see how it looks on your screen. Can you post some screenshots?
Also what method did you use to get it into PS where you say it looked even worse? As a PSD file or as an image file like .tiff, .png, etc…
Which OS are you on, Mac or Windows.
Do you sue any hardware/software to calibrate you screen?
Maker Of Replica Macoys
Techie Stuff:
ArtRage 6.1.1 ~ 15" Macbook Pro ~ macOS 10.14.6 ~ 4 Core i7 3.1GHz CPU ~ 16GB RAM ~ Wacom Intuos4 M