I got Porcelain Veneers and not happy with color due to paint on top layer of veneer. Is this normal for veneers to be pained?

I got16 veneers fitted-and not happy with colour. I've chosen B3 and I liked temps look,but when my veneers were fitted I have noticed that they are more yellow than the sample-close to gum was at least shade darker than the ends. I was told top layer of veneers gets painted to give more natural look and it can be easily removed.But now surface is not even-it look partly glossy partly mat.Is it better to redo upper veneers,or more polishing better option? Also,is it normal veneers to be painted?