3D w/ Photo

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I want to join photography and 3D into one thing.
Create a 3D scene or object and put it into JPEG via Photoshop.

I drew an example. I would like to make this into 3D. I have little bit of knowledge of modeling, so modeling the models itself won't be a problem.

My question is how to make it look realistic? I suppose you should add textures to models, then some kind of lighting into the scene and so on...

I have only the knowledge of modeling the models, but I need to know what are the other steps to making it look realistic.

Can anyone please help me?
Thank you.