Thank you very much! :-)
For me as a newbie it's important when I look at an artist's collage, that they mention the programs they use.
You're right. That's an important information. I always asking myself the same question when exploring art works.
In detail I used Gimp 2.10.x, Blender 2.8.x and Make Human Community.
Gimp for all the image manipulation work, Make Human for creating the human models and Blender for detail corrections on the models.