Version 6.

cfg scale can be quite different. I got nice results from 2.5 to 7 (I haven't really tried higher). Also v6 doesn't even need quality tokens in the positive prompt to give good results. At least as long as realisticvision-negative-embedding and epicrealism-neg are in the negative prompt.

Version 5.

The model should require less token in both positive and negative prompt to get realistic results, now.

Low CFG scale ~2.5 gives a nice photo-realistic look to the picture and allows you to go a bit crazier with the weighting in the prompts.

Heun sampler with as low as 8 steps also gives quite nice results.

Version 4.

Initially built to create lifelike portraits of characters from the novel I'm working on, whose title is Endless, thus the name of the model.

This is a rather complex merge, and sadly I did not took notes.

Prompting

Example of prompt for a realistic image (replace {prompt} with your subject):

professional photograph
{prompt}
((video grainyfilm)), natural cinematic lighting, ((professional photo highly defined))
realistic, best quality, photo-realistic
8k, best quality, masterpiece, realistic, photo-realistic

You can add more details using this lora which gives pretty good results: Detail Tweaker LoRA (细节调整LoRA)

Example of negative prompt for a realistic image:

(text, signature, watermark, logo, ux, ui:1.3), monochrome, (2D), (3D), ((camera)), ((cartoony)), (CGI), ((drawing)), ((lowres)), ((painting)), ((sketchy)), ((The Sims)), (ugly), ((blur)) (worst quality, low quality, normal quality:1.3), lowres

NSFW content is possible, nsfw, uncensored in the negative prompt can help get rid of them.

More tips on prompting

You can actually use negative weights on lora/lycoris. Here is an obvious example with Microwaist Lora:

Using this, you can use Sharpness Tweaker LoRA (锐度调整LoRA) to lower the sharpness of the image, resulting in a somewhat more realistic picture as if it had been taken by an old camera. Here is an example showing the effect on girls of various ethnicities:

Full resolution of the above grid on imgur