You can fix the underexposure and lack of contrast, but you can't fix the soft focus.
Thank you for your reply. I will try to be more careful with my camera settings and focus.
Look to two things when you check your pictures on your camera's screen: focus (at 100%) and the histogram. When getting the file into your editing program, check both again. Out of focus pictures can't be used (except if it is your baby child and the grandparents need a picture, they don't care about crisp sharp pictures...), bad exposure can be corrected. Underexposure is easier to correct than overexposure. That's why some cameras tend to underexpose pictures, BTW.
There are burnded out highlights that cannot easily be repaired.
Here is a lightRoom example:
Thank you for your reply. I will review the camera settings and shooting environment, and also check the histogram carefully before submitting.