The room looks lovely. The rug is too light in fabric weight - it could be dangerous if someone caught their toe under it. And as mentioned by others - you need some colour. I know that it is advised by some people that a mat should go under the furniture, however, that is not always possible.

I don't know about it , can you change it, you can have modern and different but I think your tv unit is mid century style and table is Well I don't know what style it is than you say you want tribal . As someone suggested earlier , stop shopping before you move in it might be all wrong and your taste and ideas might change by then. Trick in decorating is to be patient and only buy when you are absolutely sure that you can take it back. Ha ha.

Agree with above comments - large rug, darker colours to balance the beige. And I also think the art work is too small and too high. However if you are attached to these pieces they could be hung together on one wall, lower, maybe re-framed in similar frames to give them cohesion (black to match your new cushions?). This would create the effect of a larger art piece. (The centre of your art should be at average eye height - and in that room you are sitting so eye height is lower!)

If you like round rug then go round rug. Will suit your gorgeous chair. Just make it large enough for legs of sofa and chair to sit on.