Like I've said before, Aleks...this ref is really hard! If you try to adhere to the lighting, it really causes havok with the baby's features.
I did a photoshop alteration. It's purposely rough with darker colors so that you can see where I made marks.
I'd suggest shading more at the back and front of the head and the eye areas. Also, a touch of shading in the highlight of the cheek will give roundness. Just shade it lighter and you can still maintain the sunwashed look.
I also moved the baby's nostril over and modeled the nose a bit more. If you look at the ref, the angles are really linear. The curve of the nose tip almost looks perfectly horizontal.
In the mouth area, I softened and moved the dark shadow on the bottom of the mouth/cheek and made the left side (our right) of the baby's mouth curve up a touch more.
Keep at it. I can't tell you how many times I had to "fix" the baby's face with my graphite one. Don't let it frustrate you.