If your wall isn't smooth enough, consider skim coat it with a layer of plaster to make it really smooth and looks nice from every angle.
Skim coating is important especially if you plan to paint the wall with Pearl Glo paints, or to install wall paper on it. Uneven wall will look wavy and not nice when painted with shiny paint or installed with wall paper. The effect is even maximized under the light.
During renovation, I had done skim coat treatment to all the walls downstairs of my house (excluding those in the kitchen with ceiling height tiles) before applying the ICI Pearl Glo paints on them. That had costed me for a few hundred ringgit only.