First, a nice looking bare eyed cockatto! I hope it is your bird.
The depth of field is shallow in this image, and focus is actually about at the back of the beak. It is difficult at best to get this kind of shots in low light and have more DOF, partly because the subject usually is not completely still so you have to open the aperture to keep exposure time short. It is more difficult to focus in low light as well.
I find that manual focus works well for this kind of macro snapshots by getting the focus close, then moving the camera slightly in or out to put the focus exactly where I would like it sharpest.
Exposure is good. It is easy to overexpose white feathers on birds in a darker background, but I see that in this image that most of the image is feathers, so the normal metering should be good.
Keep shooting, and keep posting. Take good care of the bird if you're it's human.
My favorite 'too loved coffee, but it isn't good for them.