i have been telling people for many years, when doing any work, physical, photographic, or digital, there are a number of items which can make or break an image.
accuracy, composition, colour, and lighting are some of those items. here we have two images which are 'exactly' the same, except for two items. the first is i fixed a mesh error from the first in the second. you will notice it on her left arm in the top half. the second is the lighting.
when i started this image, i had an idea of how i wanted the light to fall on her face. i wanted there to be a a division between the left and right sides of her face. i wanted there to be a light glow on the left side, and especially prominent lighting on her nose, but a near pure shadow on the right side. except for a minor light reflection showing on her right eye.
the top image has all of those qualities, but it was missing a hint of blue and had too much orange light.
in my opinion, the second/lower image was a vast improvement. though, i probably could have adjusted my fstop more.