Custom paint and scribing. There’s no decals on this kit. I was inspired by a picture I found of an HG Gouf 21st Century Real Type. It tool a week of painting after work to de-Smurf, but I’m fairly satisfied with the way it turned out. My ham hands broke the horn 3 times and an ab joint once. The horn was my fault, but the abs are a weak design and care should be taken.
You could try printing out your own decals. That's what I did for the shoulder decals for my MG Gundam American Type build. I scanned the original EG decal, scaled it up, and printed it out on decal paper.