I would put a beatuful full length mirror and a small bench in front of it.

Is it deep enough for built in shelving?

Perfect for a mural and a small bench

I have fireplace on the same place first floor and basement I think it mean to put a fireplace there. The last owner of the house seems hasn't finish the master bedroom when they sell it. All other room are finished nicely. And shelving looks to narrow I think

A fireplace would be lovely, but costs will vary depending on your choices, etc. I would have a few quotes and they may also suggest some great alternatives. Here is a nice look for a bedroom and in your case, the middle would be receded and add a beautiful mirror above. On either side you could have floating boxed shelving and add sculptures etc. and add stick on pop lights inside. It would such a beautiful wall.