How to make an Human Eye

Create a new document of 1560 x 1040 px
Create 17 layers and name them as : layer 00, layer 01 ... layer 16


Abbreviation
L: Layer
SRB : use a soft round brush
W : Width
C : Color
O : Opacity
E : eraser
GB : Apply a gaussian blur

Layer00 . Apply the color #8d8d8d
layer16 . Draw the shape : SRB (C : black ; W : 15 px ; O : 100%)
layer01 . Color each part : SRB (W : 100 px ; O : 100%) C : #5a5a5a / black / #f2f2f2
layer01 . GB 7 px

layer 02 . SRB (C : #3a3a3a ; W : 100px ; O : 100%)

The skin crease is more marked in the upper eyelid than in the lower eyelid
layer 02 . GB (30px)
layer 02 . Erase if the shadow is too large : E (W : 100px ; O : 100%)


layer 03 . SRB (C : black ; W : 50px ; O : 10%)

layer 03 . GB (15px)
Hide L16

layer 04 . Continue to work on the shadows (don't forget the eyeball) : SRB (C : black ; W : 100px ; O : 5%

layer 04 . GB (30px)
layer 05 . Start to work on the lights : SRB (C : white; W : 65px ; O : 15%)

layer 05 . GB (15px)
layer 06 . Work again on the shadows with a different size of brush : SRB (C : black ; W : 200px ; O : 15%) & SRB (C : black ; W : 45px ; O : 15%)

layer 07 . Use this layer to work on the detailed lights (iris...) with a little brush : SRB (C : white ; W : 20px ; O : 10%)
layer 08 . Use this layer to draw the largest light : SRB (C : white ; W : 100px and 200px ; O : 10%) and adjust with E (W : 65px ; O : 100%)

Merge all the layers : layer 00+ layer 01+...+ layer 08

Use dodge and bum (expo : 4% ; W : 200px/50px) to correct shadows and lights as you want

Eyelashes : The eyelashes belonging to the upper lids and the lower lids vary from each other. The upper lid eyelashes are longer, tend to curve in an upward direction, and are more noticeable than the lower lid eyelashes, which are shorter and tend to be stumpy without much curve. There are two or three rows of eyelashes in the upper eyelid and one or two rows of eyelashes in the lower eyelid.

layer 09 . Draw eyelashes on upper lids : SRB (C : black ; W : 17px ; O : 100%)

layer 09 . Smudge the extremities of eyelashes : Smudge (W : 45 ; strength : 25%) and correct if it's too long with E (W : 65% ; O : 100%)

layer 10 . Use the same tools for eyelashes of lower lid

layer 11. Add some shadows with a big brush under the eyelashes : SRB (C : black ; W : 100px ; O : 10%)
layer 11. GB (25px)

Create a New Adjustment Layer : Gradient Map :

Black (0 %) #421706 (16%) # c18362 (44%) #ffdba3 (70%) #ffe2c8 (88%) white (100%)

layer 12 . Change the layer blending mode to Hue and its opacity to 70% and color the iris : SRB (C : #175769 ; W : 100px ; O : 100%)

layer 13 . Change the layer blending mode to Color burn and draw with a SRB (C : #cfc179 ; W : 100p x ; O : 100%)

layer 14 . Change the layer blending mode to Hue and its opacity to 80% and color the eyeball : SRB (C : #436d94 ; W : 100px ; O : 100%)

layer 15 . Change the layer blending mode to Multiply and draw the outline of the iris : SRB (C : #366561 ; W : 30px ; O : 15%) GB (8px)
Make any necessary corrections...

I hope you enjoyed this tutorial