This image was generated by using the following prompt:
Prompt: a single red rose on the desk, post processing, post production, detailed and intricate, tone mapping, hyper realistic, photorealistic, ultra photoreal, ultra-detailed, intricate details, 8k, super detailed, full color, surrealism, full detail, ray tracing, best quality, extremely detailed.
Negative prompt: (worst quality, low quality, normal quality:1.8).
Select the rose petals with Quick Selection Tool.
[Control + C] and [Control + Shift + V] to paste into a new layer.
Select the first layer, and go to [Image -> Adjustments -> Black & White].
This is the end of the tutorial. 🙂