Outdoor portraits don’t need a fundamentally different workflow than indoor ones. Start in Adobe Camera Raw and correct the basics first: white balance, exposure, contrast, and any needed noise reduction. For this image, the main issue appears to be that it’s a little underexposed, so raising exposure would be a good first step.

Then refine the composition. If the flowers and lawn aren’t helping the portrait, crop them out to put more attention on the baby. A subtle vignette can also help draw the eye inward.

After the global adjustments, sharpen carefully: apply mild overall sharpening in ACR, then do selective sharpening in Photoshop on important details like the eyes rather than sharpening everything equally.

For future outdoor sessions, try to get as much right in-camera as possible. Check the histogram whenever the light changes, because outdoor light can vary quickly. Leaving a bit more room around the subject can also make cropping easier later if distractions appear in the frame.