How to imagine and draw a portrait of an old man｜photoshop drawing｜painting in photoshop

Описание: How do I use a portrait of an old man and a picture of a rooster as inspiration for a painting to create a complete design?
I imagine an image, then design it based on different themes, and then find some reference images.
Combining these elements to create the piece I want to paint is actually quite difficult. Combining the characteristics of these two images is quite challenging.