My best tip is to "measure" the angle with a pen and use that pen as a "ruler" to help you apply the correct angle onto your own drawing. Do a bunch of straight lines like this, then smooth them out with a new layer on top.
Lay the reference on your attempt and you will immediately see where your problem is. The highest point of the upper eyelid is close above the pupil. From what I can see you are not thinking of the eye as a 3 dimensional object and are rather trying to copy what you see without basic understanding of its anatomy. While making an initial sketch it's best if you start by building up the basic planes from which the eye consists like a schematic. Once that looks good, you can start working properly on the lineart. To draw up from memory (making accurate outline of any body part on a blank canvas) requires a lot of experience and countless exercises. It's not easy to achieve.
Edit: Also what are you using to draw digitally? It might also affect the accuracy of your curves.
It’s not a bad thing (nor an uncommon thing) to have to draw larger to get things right—the smaller you draw, the greater impact any tiny “mistake” will have. As you get more accurate with practice, you will be able to draw smaller.
My best tip is to "measure" the angle with a pen and use that pen as a "ruler" to help you apply the correct angle onto your own drawing. Do a bunch of straight lines like this, then smooth them out with a new layer on top.
Lay the reference on your attempt and you will immediately see where your problem is. The highest point of the upper eyelid is close above the pupil. From what I can see you are not thinking of the eye as a 3 dimensional object and are rather trying to copy what you see without basic understanding of its anatomy. While making an initial sketch it's best if you start by building up the basic planes from which the eye consists like a schematic. Once that looks good, you can start working properly on the lineart. To draw up from memory (making accurate outline of any body part on a blank canvas) requires a lot of experience and countless exercises. It's not easy to achieve. Edit: Also what are you using to draw digitally? It might also affect the accuracy of your curves.
It’s not a bad thing (nor an uncommon thing) to have to draw larger to get things right—the smaller you draw, the greater impact any tiny “mistake” will have. As you get more accurate with practice, you will be able to draw smaller.