Print at 0.3mm layer height, use Tinkercad to put a name/phone on it - do at least a 0.3mm indention for that.
Here are the layer heights of the butterfly_keyring_4_layers.stl if you want to change filament to get 4 different colors:
Layer one (white): 1.8mm
Layer two (pink): 2.7mm
Layer three (blue): 3.6mm
Overall height: 4.5mm
Here are the layer heights of the butterfly_keyring_2_layers.stl if you want a 2 colored butterfly (this file also works better for hand-painting):
Layer one: 1.8mm
Layer two: 3.0mm
Original artwork is from: https://pixabay.com/images/id-3244177/ with the Pixabay license of "Free for commercial use; No attribution required" That being said, it does look like you can donate a "coffee" to the artist!