I love the subject matter. You did a great job capturing it, but it's a learning experience. That's a really great find, and often you can go back to the same nest for a week or so until they fledge. Just stay back and try to avoid doing anything that would encourage a crowd. You don't want the adult to abandon the nest or not be able to feed the owlets because people are too close. Brief visits are best.
As others have mentioned, if you have a RAW file - the NEF - it's a lot easier to adjust exposure, shadows, or white balance without creating problems like more noise.
It looks like you have a white vignette around the frame edge. The only reason you would normally want a white vignette is for printing on a notecard or similar publication where you want a soft edge. In that case, I'd want a wider and more gradual oval vignette. But other than that rare case, avoid a white vignette. If you choose a darker vignette, it should be subtle enough that it is not really noticed - it just looks good. Just a little darkening is enough.
I took the liberty of editing the image. All this was in Lightroom Classic and it took about 3-4 minutes. Most of my edits were local adjustments using layers - one to the owlets, a second layer for the tree surrounding the owlets, and a third layer to brighten the rear (top) owlet. I made just a minor global adjustment to WB to make it slightly cooler and less yellow.
For the owlet layer, my goal was to make the subject more prominent and take advantage of the bright eyes. I made them brighter with a 0.30 exposure adjustment, I boosted shadows slightly, added a clarity to increase contrast, and boosted sharpening and noise reduction. This made the eyes much brighter and helped them to pop.
I inverted the owlet layer and made a copy so I could edit the tree. My goal was to make the tree recede so attention was on the owlets - not the tree. I decreased exposure 0.7 stops. I also decreased highlights, decreased whites, and decreased shadows - all to darken the tree. With these adjustments I was loosing a little texture, so I added a little contrast and clarity (I could have kept highlights brighter and decreased shadows more for a more proper edit). I also added noise reduction. Darkening the image for this layer by itself helped to reduce visible noise and would be even better working with a NEF.
My third and final layer was a mild brightening layer for the rear owl and some touch up. I selected the owl, then reduced opacity to 35% and brushed in some details on the darker side of the owlets and their left (viewers perspective) eye. I boosted exposure 0.67 stops and brightened highlights a little more. The result was more even brightness for the subject and the eyes popped even more. One eye of the bottom right owl was partially hidden and brightening helped a lot.
I finished with a crop - eliminating your vignette, the sky and bright area on the right side, and the sunlit bright area on the left side.
Here is the result. It's your photo - just a few modest edits to enhance your vision.
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