It all comes down to individual taste. There is no right or wrong, thank goodness. In my case, it just has to do with style consistency. As for colors and home design, I usually prefer calm earthy tones and simplicity. My eyes are very quick to tell me if something is too bright, contrasted or saturated

Lighting in Sims 3 can be a little difficult, but I have learned how to remove the blinding bloom effect by adding a line in GraphicsRules.sgr under 'option AdvancedRendering', under the '/ setting $On' part which is:
prop $ConfigGroup RenderPostProcessEnabled false
In case you were unaware and want to get rid of it like me.