How this phenomenon is called ?

[Meringue]

When you enter a picture on a wall, or a photograph, with ability to walk further into a world of the picture, interact with objects and beings there... etc. Thank you.

[Xanth]

I'd call that... "walking through a picture into another world". 

[CFTraveler]

I've heard it called "Virtual Reality projection".

[Xanth]

I've heard it called "Virtual Reality projection".

I think I remember that from Astral Dynamics?

[CFTraveler]

Not sure where, I thought it was here.

[Xanth]

Yes, it's definitely from Astral Dynamics.
I thought I had read that before.  It's in the old version at least... I'm sure I read it in his new edition too.
I'll have to check it when I get home.

[personalreality]

Occultists call it Pathworking and commonly do it with Tarot Cards, Runes, Myths & Legends, Alchemical Carvings/Paintings, etc.

Though, this is often done from a waking state as opposed to an astral projection (though in truth, doing this from a waking state tends to lead to projection).