First of all, you have a great camera and lens, the photo is very sharp and full of detail! But for portraits of women, this can actually work against you, as "detail" is considered "unsightly." Having a single light source and big contrast can also emphasize this. This is why portraits often have a bunch of diffused lights. These days, some people even use a macro ring flash, which removes a lot of shadows from the face, but its a difficult technique
Next is underexposure. While I appreciate that maybe you wanted to evoke a certain mood, if you shoot raw, you usually want to expose to the right. Making a photo darker in post has almost no penalty, but brightening it increases the noise a lot. So I brightened the image. In general, you usually want to overexpose female portraits, as that removes blemishes/wrinkles and creates a healthier appearance. Of course, when people process another photographer's work, we don't know what the original vision was, and we process according to our own ideas, so forgive me if I go too far.
Now on to white balance. The raw software makes the AWB really cold. I switched to "Daylight" and added a little pink. Portraits typically have to be warm and pink, not blue and green. Warm and pink are associated with health, happiness, while blue and green are cold or even sick colours. I also added a little "split toning" - added some golden colour to the highlights to give a uniform hue.
Next, crop. You took the photo up close, to make the viewer feel a certain intimacy, which is great, but you also wanted to leave in some of that wonderful reddish hair. I cropped in tighter to emphasize the vulnerability and intimacy, while sacrificing beauty. I also rotated the photo a little to get her eyebrows in line.
I reduced clarity a little bit, as well as lowered the sharpening (again, woman. Have to emphasize softness, femininity. For a man, you would increase clarity and contrast to emphasize jagged lines and features). I also added a lot of masking and basically only sharpened her eyes and lashes, careful not to sharpen the wrinkles just below the eyes.
Finally, I removed some blemishes with the clone brush. Nobody has perfect skin, this is why models wear a ton of makeup and then get a full photoshop treatment over that! Just removing a couple bumps can have a big effect, especially when you have a light situation like this, with big shadows.
Anyway, below is my finished product. I changed the mood of the photo quite a bit, I know, but hey, this thread is about showing our vision
Hope someone likes it