Hey for your first map it already looks pretty good!
Huh - I tried to make screenshots to illustrate my points via crude drawings, but amnesia wouldn't let me. Strange.
Anyway, I can only give you feedback on the graphical side: In my opinion your rooms tend to look a bit too empty and as a result of that too big.
Try to avoid having these big areas of floor with nothing on it, as the repeating textures there really catch the eye. Put a carpet on there, some rubble, documents lying on the floor, anything that breaks up the monotonous surface. Same goes for the walls (to a lesser extend).
You might also want to add more visual interest to repeating assets. If for example you have several sacks next to each other, (like in the storage room) don't have them all in the same orientation. Rotate them, lean them against each other or against the wall or lie one of them down.
As a rule of thumb, try to integrate larger objects into the scenery by placing smaller ones around it. It will make them look less awkward and out of place. (You already did this very well with the piano) For example if you have a shelf full of books, place some book piles around it or a small table next to it, maybe a with comfy chair for reading and a candle...
Also, try to create "object islands" instead of evenly distributing assets around a room. This is especially apparent in the storage room which looks a bit random right now. If you look at the original amnesia, you almost never have stuff just standing around randomly. Instead, most of the time there are these "islands" visible that look more natural. Its a bit hard to explain, this concept art here shows it pretty well:
Storage room (Three object islands as well as small candles, stones and bottles to integrate the big assets into the scenery)
Hope I could help somewhat! I'm looking forward to the next version of this map