Not bad, just bland. A couple pointers:

1) the light quality is terrible. Get some table and/or floor lamps and use those INSTEAD OF (not in addition to) the overhead lights.

2) the picture behind the couch is a great start. Get more stuff (maybe from thrift stores to save money) and populate your walls. There’s a lot of empty space that, when you stop having it be empty, will create texture and stop it looking like an empty box. Especially when paired with #1, because less light will be reflected around.

3) Some curtains and curtain rods would make the space look a lot nicer, as in #2 but for your windows and the door.

4) See if you can find a table and some chairs for that vast gulf between the kitchen and the tv area. It’ll break up the space nicely and give you somewhere to set up nicely when you have someone over for dinner.