It looks like a poster edges effect to me. That’s a quick way of getting the hard edged colors (almost like paint-by-numbers).
Start with a pic.
Open in photoshop.
Convert to Smart Object
Increase contrast to break art into desired number of color layers.
Work from bottom layer (background 1st) - select each layer and fill with appropriate color.
- Fill background with black - then move layer to bottom - this will be bottom layer.
- Fill Orange to red gradient outline - move above #1
- Black hair - move above #2
- Dark red - move above #3
- Pink - move above #4
- Mauve - move above #5
- Highlights - (will be top layer) - move to top.
Add a texture layer as a “darken” transparency and adjust opacity to desired levels of detail.
Great vid for technique: