The importance of post production is one of the best lessons I have learned from this site and I thank everyone for their CC. "Snapshot" ratings sting my ego but helped me learn the difference between a photo worth sharing and a run of the mill shot. I have learned to look at a shot and and ascertain what is it I want to convey what stands out. I recently purchased the DxO Photolab 3 and it is amazing. I have never used Lightroom and Photo Shop 1 was my first photo editing software. YEP, I am that old. LOL
This shot was at sunset with the back lighting obscuring any detail of the face and bill. Edited it Photolab 3. The light blue eye is even visible.
I guess with the light being behind the subject it is still in shadow, which software on a RAW will help you uncover. Not sure on the ISO and aperture but it looks like you had a shallowish DOF, so I am going to assume you were going for letting the light in and background blur to avoid distraction from the subject. It's a nice shot, maybe think about a less central composition or having the space to the side where the subject is looking. Quite tough to get light in and use a faster shutter speed to avoid blur from wildlife movement, especially when the key light source is disappearing behind the horizon.