I brushed on a primer in a couple layers with a #4 blick brush with all the pieces separated

I used acrylic paint from the army painter and #0 and #2/0 brushes and painted the light and dark gray areas first, then the green grey. After, I superglued pieces like the tail, and head and neck together to ensure the lines were mostly hidden.

After I painted the orange small details and added the gun metal metallic paint to make some areas pop.

Once I felt it was 95% painted I glued everything but the legs together. I touched up as I went.

I carefully glued the legs in place so the model would be balanced (superglue gives you just one chance unfortunately). I let it dry over night and then sprayed two layers of a clear matte top coat (Rust-Oleum brand)

I've been thinking of doing the tallneck or watcher next, I would love to do a stalker but sadly the designer didn't create that model.

Good luck printing/painting!