Can you put a semi gloss interior paint over a wall that was painted with a flat paint? I am painting one of the bedrooms in my house with Valspar Signature semi gloss finish paint. What I am getting is spotting or something you can see the roller marks on

I have a dark gray couch and a blueish gray / ice blue chair in my living room along with maple wood/aluminum-silver modern furniture. I’d like my living room to be “warm” but don’t want to get too color crazy. It is a smaller living room with a lot of