[Taken from Catalog Avatar Creator on Roblox]
I decided to add the blush marks seen on my ref sheet (https://www.furaffinity.net/view/55791647/) onto my Roblox avatar exclusively in Catalog Avatar Creator utilizing the accessory effects menu.

The blush marks change color depending on the situation.

This is done by using the Kemono Blush (https://www.roblox.com/catalog/12899750891/) accessory and then changing its size, position, and color to be under the eyes and the same color seen on the ref sheet.