First, nice photo. I like Tink's expression and the background.
Photoshop is deep! A detailed photo retouch can take many steps and is a more advanced than simple one step modifications. You can take your photos to another level of retouching using tools such as Photoshop but it will take time and committment. Do not get discouraged and learn it in little steps. Over time, you will see the results.
What has helped my Photoshop skills the most was using online courses. I use Lynda but Kelby has them as well. It was easier to see someone perform a sharpen, retouch wrinkles, etc. than read about it for me. They have free previews of courses so you can figure out if it is for you.
As for this picture, looks like you have a bit of a red color cast, some noise, low contrast, and hot spots/blemishes on the skin. It is suggested that sharpening is the last step in a retouch after you fix everything else.
I saturated the yellows and greens, a curve adjustment for contrast, spot healed the hot spots and skin, and adjusted the skin tone. I then removed noise and sharpened. I prefer smart sharpen using lens blur. Given this is a low res image, I used an amount of about 50% and a radius of .2. Any more seemed to over sharpen for my tastes. Many different apporaches to sharpening. Sometimes, you sharpen the entire image while other times to selectively sharpen.
Here is the quick retouch.