Ending your prompt with the following segments is probably the best method. Name may differ for different versions.
art by WASMoebius
art by [(WASMoebius):0.5]
(Less effect)
art by (WASMoebius)
(More Effect)
art by [((WASMoebius)):1.5]
(Extreme Ultra Mode)
Example Positive Prompts:
A portrait of a beautiful woman, art by WASMoebius
a sprawling desert with mesa plateaus in the background, art by WASMoebius
Example Negative Prompts:
(((3d, cgi, digital painting, smooth shading, vibrant), disfigured, bad art, deformed,extra limbs,close up,b&w, weird colors, blurry, duplicate, morbid, mutilated, [out of frame], extra fingers, mutated hands, poorly drawn hands, poorly drawn face, mutation, deformed, ugly, blurry, bad anatomy, bad proportions, extra limbs, cloned face, disfigured, out of frame, ugly))
(((3d, cgi, digital painting, smooth shading, vibrant)))
It's a trip. Lol Jean has one hell of a style. Capturing line and color style is one thing, but his world is from all sorts of perspective, so cohesion is hit or miss. Far away people will likely need some sort of img2img on their faces due to the ink line size interfering with details, least from what I've seen.
The colors are far more flat, and thus accurate to Moebius in Stable Diffusion 1.5, but composition is pretty bad in vanilla 1.5 versus other models. So, I chose a custom model for sample images here, but all the models I have are all meant for photo-realism, so I had to negative weight a lot to get the depth toned down.