How to render a horses eye in pencil

Sketch faint outline. Create a "map" workout difficulties.

Find and establish the darks, 7B used. Correct eye shape and work up a correct form leaving white for highlights and eyelashes.

Keep working on the darks.

Add tones and values, create detail . A 2B pencil is used from now on.

Define the contour of head and eye socket. Use loose strokes to indicate the hair.

Keep working on the contour and head shape. Use the darks as tonal reference. Create layers of 2B to create more intensity and define the shape.

Detail added to and in eye using a 2H.

Bringing the values together. No blending only layering with 2H

Final tweaks added to eye and skin. For more impact dark background penciled in with 7B and blended with soft charcoal.