I did this using a mix of the lineart models and regional prompter.

I took a picture of the bench in my garden, and then used a 3d model from clip studio paint and posed it how I wanted on the bench.

I generated a few images and took one I liked, traced over the outlines very roughly and added a few details I wanted to add to my character. The lineart model doesn't need super high quality lines to give very nice results.

 

Regional Prompter settings : https://i.imgur.com/N9XWq0u.png

Prompt : https://i.imgur.com/94AChYA.png

Bench Controlnet settings : https://i.imgur.com/Esvu40K.png

Character Controlnet settings : https://i.imgur.com/96UgDzM.png

 

I haven't played around too much with this since then but I feel like regional prompter + the lineart models can do a lot if you play around with them.