last month I made this tutorial for eye drawing, you can check if you want..

https://steemit.com/art/@marty-arts/eye-drawing-tutorial-step-by-step-tweaks-eays-for-about-15-minutes

you make the same mistakes as every beginner....

• lines should have different thickness and intensity...
• lines shouldnt be too simple and straight...
• do round shading on the round places
• do more shading, instead the drawing would always look flat
• dont use wrong direction of lines ( I mean the iris has one centre)
• use right proportions (the part where the tear ducts are should be bigger)
• eyelashes are round and has its own direction in different angles
• the reflection inside looks better when its round, or it excedes the pupil..
• do more work with the upper eyelid
• the eyelashes on the lower eyelid are separated, they are not connected in one line
• use patterns... its better to learn drawing according to another drawing..

Hope it will be useful for you ;)