"A good construction(drawing) will always produce a good painting..."
Not necessarily true if you aren't experienced enough to know what to do with it as far as color, texture, lighting, value, etc., are concerned.
"...and it is probably the most important. True?"
...but I'd have to agree with you here. Trying to save a bad idea or drawing by adding paint is like being proud of how nice and professional your new roof on your house made of cardboard boxes and rat poop is.
No position or belief, whether religious, political or social, is valid if one has to lie to support it.--Alj Mary
Ironically, the concept of SIMPLICITY is most often misunderstood by simple-minded people. --Alj Mary
I am just wondering that if you have a perfect drawing(correct proportions, pose, design), the outcome of the painting will be good even with lousy values, textures and color.
I understand that the painting will not always look the same as the drawing but as long as the proportions of the first drawing is correct, it will still look good. It's just that the design or the features will change.
I tend to believe your image is as good as the worst refined element. Got great poses? Great, too bad the colors suck and nobody can tell what's what anymore due to bad values. Or vice versa.... if an element sucks, you've sold the rest short a bit more than you could have had you refined it further.