The Illustrious version of my SD1.5 Lora. Trained on Illustrious here on Civitai. Tested with more than 15 most used IL-Checkpoints. You can simply gen beautiful females standing by the window. Best easy prompt here would be

1girl, window, breasts, blue clothing, areolae, 

Use strength between 0.7 and 1.0 for best results.

Without any other prompt editing you will get beautiful sexy female upper body looking towards the window/viewer. She is slightly embarassed and blushes lighty.

Have fun and upload your images - I would be really glad to see them here!