Hey hyoi,
Thank you very much for the explanations, it took me some time, but i understand and i'm working on now
I've took lines on my ref and find the problem, the horizon line is not at the right place,
So i've transposed approximately the horizon, make new lines, and use perspective tool to correct a big part in one time,
after that, i select the interior and rescale it, so that the top of the stairs is not visible, and "give more sens" to the perspective.
Now i need to review some lines in the bottom of the canvas, apply manual corrections,
and finally it should be good