Because he likes eggs.
Maybe he is using it to symbolise something in his life, perhaps he is portraying that he feels very fragile. Or he could paint it to release his emotions, he may be in a relationship or stage in his life where he feels everything he does is wrong, maybe he feels he is walking on egg shells. Or maybe he isn't a very talented artist.
No and yes it depends
the shell of an egg
No eggshell is a reference to sheen purportedly to look like the shell of an egg not a color Also there is no standard interior paint eggshell is a common sheen as is satin for interior color is the choice of the one who will accept it
the egg would then become poisoned
You use a thin knitting needle to make a small hole in both ends of the raw egg. Poke the needle inside to burst the yolk. Then gently blow through one hole until the insides of the egg has oozed out of the other hole, leaving an empty egg shell. You can now paint the egg shell as much as you want.
This is an egg that can be in a shell and out of a shell.
the shell of an egg
It is paint that has a special finish that is neither Glossy nor Dull. If you are touching up a room and don't match the finish, it will be obvious when the paint dries.
is the shell of a hen egg as brittle as the shell of a duck or a goose egg
latex or egg shell
egg shell