Renovation and Resale

I have a small studio and I'm trying to figure out how much to spend on renovations for it to be worthwhile when I ultimately sell. I know that most renovations end up paying for themselves in the resale, but certainly not all of them do – especially in small studios like mine. So far, the kitchen and bathroom are already renovated, but I was going to add crown and base moldings, track lighting, a radiator unit and renovate the closets. Does anyone know if moldings make a small apartment look smaller, or have any insights into whether I might just be putting too much money into the place? Any insights are much appreciated. Thanks!