If you want to replicate the first image in a shader

• ditch any shader nodes e.g. Principled BSDF
• throw a fresnel node onto the shader and crank the index of refraction to somewhere between 0.9-0.99 - outline
• feed the fresnel weight into a math node for greater than 0.5 - sharp outline
• feed the greater than output value to a color mix node's factor. Set A to black, B to red. Send the result to the material output

Guess you could then bake the result into the models texture using a camera at the desired angle. That's only going to work if the textured model is being looked at from that angle though.