Hi Loi, OK thanks for the file and at present it's just uploading to send back. had to cut the size down a fraction as it was over 500mb as it's a TIFF rather than a JPEG.
Firstly I see you put the FP on the right eye as viewed, IMHO that's fine if you have a greater DOF, I might have placed it on the bridge of the nose on a line to the bottom of the eyes to try and get both eyes & nose sharp, but at f/4 a little tricky perhaps?

I tried to get as close to a mid grey for the WB which I measure around the nose, this gave me a 6700. I just opened the exposure up a fraction +0.20, no contrast. Dropped the Yellow by 50%. I also tried to get back some detail in the white areas ie under the eyes & nose. Cleaned up the eyes and changed the green cast in the iris to a black. Obviously how far you take things is purely personal. I also dropped the exposure a fraction to the BKG to try and lift the subject out. Applied some sharpening then exported to PS. Made some Mid tone adjustments, added 2 points of black to the neutrals & black. Applied some gardening to some bits off grass,
not visible on this, but you will see on the uncropped version. Cropped & applied some selective USM. What I have done is only my take and have NO idea how close this is so will be interested to know, however I have tried to keep close to the original file. I would look at a skimmer pod to help steady your lens, especially at this low SS, easy to use and works well in this situation.
Here you go, plus have gone for a slightly tighter crop too.
cheers
Steve