I use blender a lot, but now the .blend files and images files have the same icon.
It would be way more readable if they .blend files would have another icon.
In your screenshot, the icon is identical to the .png file shown. It may be that the application-x-blender icon symlinks to the same base file as image-x-generic...
I wonder if it is a Gnome/Nautilus issue? Out of curiosity, I installed Blender on Devuan 4.0.0 in KDE (Plasma) and get the correct icon - see if installing Plasma gives a different outcome?
You can change any icon by altering the file in its location, really (/usr/share/icons/ICON-SET-NAME or ~/.icons/ICON-SET-NAME ).
For many applications, you can also specify which icon to reference in thta applications desktop file (/usr/share/applications)
Change the icon's name to the mimetype of the file (right click > properties > type), in my case 'application-x-blender.svg'
Move the icon to the correct folder: $ sudo mv '/home/hanne/Downloads/blender file icons/application-x-blender.svg' '/usr/share/icons/Zorin/scalable/mimetypes/'
If the folder does not yet exist, you may create it.