It's time to share with you what I've learned after many iterations and trying everything I could. The goal was simple – to recreate the same style I used in SD 1.5, but make it more beautiful and complex.
Flux prompt: "realistic body proportions, (illustration:0.5), (cartoon:0.4), soothing tones, calm colors, {scene prompt}, highly detailed photography"
Stage 1 is the creation of the scene in flux. At this stage, it is important to achieve a good balance between stylization and realistic anatomy. Flux can react strongly to the "illustration" and "cartoon" tokens, resulting in a disproportionate body with a large head and small body. To balance this out, we will use the "realistic body proportions" token at the beginning, so that the other tokens do not alter the proportions of the character. We will then use the "illustration" token with strength 0.5 and the "cartoon" token with strength 0.4. Increasing the power of these tokens can lead to a more cartoonish look, while decreasing it can result in a more realistic one. Finally, we will add the "highly detailed photography" token to ensure a balance towards realism, as its position at the end has the least impact on the overall result. SD 1.5 prompt "illustration, cartoon, soothing tones, calm colors, {character appearance prompt}"
The second stage is the transfer of the character's appearance using SD 1.5. I use this prompt and, in inpaint, I change the face, hair, and neck in 800 x 800 resolution with a strength of 0.5. Next, I select only the face and change it with a strength of 0.4. Due to the fact that I am selecting only the face the second time, the quality will be much higher.
Stage 3 - Final Styling. In Inpaint, select the face and hands. In the mask mode, select "inpaint not masked". Set the denoise strength to 0.4 to achieve the desired style.
Stage 4 is only for NSFW images. If I need to undress characters, I do so in SD 1.5. In Inpaint, select the area to be stripped and add the "nude" token. Depending on the character's body type, we also add "big/medium/small breast" tokens.
In order to achieve better results, it is necessary to first create a woman wearing a bikini in Flux in order to avoid making denoise strength too high.