Portrait Photo that I need some help/advice with please!

[Brandini Just Like Magic]

Here I have a photo from a client of mine, and they only have the format of JPEG. Im having trouble with getting the blue tones from the left side of his face where the light hits his cheek and neck. I have Adobe Photoshop, LightRoom, and Adobe Photoshop Express. Any help would be greatly appreciated as Im not familiar with using JPEG only. Also the photograph needs to be dumbed down to being a 2" diameter circle. Thank you in advance!

Below is the Photograph in question!

[Jqqerry]

You can use simple selection(Lasso, Magic Wand, Quick Mask, Object Selection, anything). And Selection(His Face) to Group Mask, Correct them.
Something Like this.

1. You have to check Luminosity Problem first.

As you can see, Male's Face is much brighter+Low Contrast than Famale's face.

2. Decrease Luminosity for match (Curve, Level, anything)

3. And You can see now color issue.

4. Go to HSL adjusntment tool, And little fix. (Or Curve, Level anything)

5. Also, Pick color(Blueish Area on Face), Edit value range skin, And fix more

6. And finally, If still some have problem or issue for face, fix them. (Quick Mask.. or just use brush)

I wrote it down in the easiest way possible. It's better to match the color while applying the curve partially.
Photoshop has no fixed path and can be applied as desired.

[c.pfaffenbichler]

Sometimes painting on a Layer set to Blend Mode »Color« might suffice. 

[D Fosse]

I was going to say exactly what @c.pfaffenbichler is saying, and do it in exactly the same way. No need to overcomplicate this.

I don't even think the cool light on the left of his face is the reason it looks a bit odd. It is because there is very mixed lighting here. At first I thought it was a composite, with the couple lit mainly from the right and the background mainly from the left. But as far as I can tell on closer examination it's apparently the real scene. There's just light sources all over the place.

[Jqqerry]

The writer thought it was important to be in the best condition because his "customer" asked for this picture. And yes, that's right. You can also use a color blending mode and brush to apply it, but there are many pictures where the method can be applied, but not. And in most portrait corrections, you have to correct it while maintaining the different gradients of the color that the skin has, and it's not good to just unify it into a solid color. Invalid unifying. And actually that process is not complicated. The process of adjusting the brightness and correcting the color tone or complementary color is completed in 15 seconds. I'm just showing him the way to get better quality retouching when he delivers photos to customers in the future.

[c.pfaffenbichler]

If I intended »unifying« I would probably have used a Solid Color Layer instead of painting on a pixel Layer, where I can pick the color and paint different regions differently. 

[c.pfaffenbichler]

To cut a Layer to a circle one can use the Ellipse Tool and a Vector Mask, then use 

Image > Trim > Transparent Pixels

on a copy of that image and scale it (Image > Image Size) as necessary.