Just now I realized that, you are right about the scale I will look into that when I will do the revision. I forgot to add that this Villa is existing, the work covers only a make-over. The arch that divides the living and the dining are structurally built in there. The client even me wanted this to be straight but it's not possible. We cannot cut the arch or cover up the below part that makes it lower.
For the curtain box with the wallpaper, I tried to organice that all the curtain boxes within the living area and dining are the same but I think you are right...it is too much looking on that angle.
Thanks for so informative suggestions, I wish to be hired...lol!