Monique,
the room looks ideel. I would go for the east facing window for primary light. And a light box, with several "daylight" tubes, under the seiling, for night/suppliment light. Maybe hanging in a railing system so that you can chance the placement if needed.
I would place the depot room behind a curtain of some kind, or doors, on the northern wall. The curtain should me a darker, neutral color to avoid light reflections onto the wet paint. The depot should contain ALL objects that you don't need at hand right now. No shelf with paint tubes or decorations, if you get me? It adds up!!!!
You could have a working table on wheels to move around with the easel, containing palette and so on.
I imagine that you stand in the middle of the room, facing towards the south window, and having the working light inn from the east wall window. The south window could have inside shutters to blind out the light if needed.
The floor could be wood and you could have a
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