Step 3 - Using the Ellipse tool or Pen tool (P), draw the pupil of the eye. Then add some reflections with 10-20% transparency. To add depth, I made a glossy reflection using a radial gradient of opacity (create a two-colour gradient with the same colours and make the outer colour transparent). Select all eye shapes and group them (Cmd/Ctrl + G).
Step 4 - To make the beak, first draw a round shape and fill it with a base colour. Using the Mesh tool (U), add some columns and rows. Move mesh points with the Direct Selection tool (A) to get the shape of the beak, then fill the outer points with darker colors to add volume. Then add some details (such as reflections and nostrils) with the Pen tool.
Step 5 - Now let’s do the feathers. In a new layer, draw an oval and drag its bottom anchor point with the Direct Selection tool. Fill it with a gradient from top to bottom. Place the feather layer under the eye layer.