Craziest thing when i am making my assets the longest part for me is neatening the quad edges, i.e when i cut a fancy neckline, because its all quads the mission is to get all the squares to flow and look smooth - then i discovered the looptools addon, its been there all this time and you simply click relax, and done!!. so even making circular cut - say in the back of a dress, one would simply select some vertices to make a cube, delete these, then select the edge loop made by this deletion and then click relax, and suddenly its a perfectly smooth circle.
here is an example, if you look at the dress i just recently made, when i said i rushed it, i didnt sit and move all the neck line vertices to make it smooth. now i discovered this and with one click it is 100% better.