Visually from the side the hero looks very thin, but technically you cannot 'headshot' the hero unless you are facing the hero directly and shooting into the painting.
I'm not the best artist but it would be cool if the painting looked 3D as well, like had its own 'room' and maybe allies can jump inside the painting for an escape. Or Celeste's balls jump in the background in the image.
Just expanding on the idea if the allies can jump inside this hero's room then enemies would be able to too.
However, the hero would need an ability or button that would let them stop engaging in the 'real world' of Deadlock and walking around as a painting to change to moving the character within...
This could essentially let the hero escape from their shell or room if theres an enemy hero present but I should think that they still share damage with the painting frame and hero?
Okay with this ability/room, you can have another painting that leads to another room/painting on the map.
For example:
There's a painting of the midboss that lets other heroes direct access to the midboss room if they can get inside this hero's painting room and run into that painting of the mid boss (which is a painting portal).
Or within the room there's a gallery painting room with a bunch of paintings - not just access to midboss.
Then you can introduce like a portable gallery painting room item...