How important is it if it is based on making scenes.

For example, lets say you make a breath taking scene very real and everything, but not all of the stuff in it is modeled by you, then can you claim that you "Created this scene?"

or you can only say that if you modeled everything in the scene?

When is it necessary to model?
Can you claim to be a 3D artist if you don't model alot?
In 3D videos and demo reels, does everything have to be completely modeled by you?
Most of the galleries here, is everything model completely from scratch?
Is it ok to not be able to model everything and anything?

I hope you guys understand what im trying to ask.

Don't let failures get to your heart, and also do not let success get to your head.