The Process (Which is as Important as the Goal)

I used to just dive into a painting. I'm talking about bigger paintings. I'd have a few sketches and ideas but I'd just start laying on the paint and hope for the best. I'd always reconsider things too late in the game and think that I should have had a more solid plan. As time passed, I started making more and more complex drawings before hand and preceding the painting with loads of conceptual work. Then I gave more and more thought to how the colors would interact and what the best way to approach it would be - do I put a background on first or start with pure white canvas and just lay the colors down or do I do a monotone painting on the white canvas and then proceed to glazing?
There's so many different techniques and approaches to creating a painting but, ultimately, what is important is the final outcome and the feeling you want to evoke. The texture and grain of the canvas are as important as the colors. The background is going to set the whole mood. And if you decide to go with gradual glazings then you have a whole other set of variables to consider.