I think to make it look symmetrical you need to do a bit of moving about and it can look fantastic. I had had the same issue and did a bit of moving about. Try to remove the carpet underneath as it looks busy with it and takes the focus away from the table. I would also add some colour on the table, like small green pots and add a few books to complement the colour scheme. Well our taste is individual and if you think it's working then it's working. :) send us pictures after rearranging.

Here's an update on the work. I've finished the pebbledash first coat, and the painter did the fascias, soffits, door and window. The green I chose came out a lot darker than I thought, but never mind. What do you think? What's left to do is add some nice pots in front, put up the guttering (I'm going to do that now), another coat of the white masonry paint, and of course the most important part, put a cat image in the window!

please suggest if contemporary or classic ?mirrored or transparent glass or black glass top ?steel or wooden frame?

I'd go with a normal mirror, anything else will probably look weird, if you don't want to watch yourself eat, sit with your back to the mirror or make sure that when you are seated, the bottom of the mirror is high enough so that you can't see in it. After all, it would also be strange to have the bottom of the mirror the same height as the dining room table, as it would surely be too low down.