Welcome to the club! :)
I think as for the first try, it's a good quality render. I would put some more effort for example in the wooden planks on the floor. They seems to be a bit repetitive, and I think there should be more randomness in their reflection also. And another tip, to increase the realism of your render is to not make the outside view that visible. In a situation like this in real life (sunny, bright outside, no lights switched on inside) the view should be blown out because of the exposure of the camera to get the inside bright enough for the picture :)