I know I said i'd do William next, but i needed to do a study on Alois' eyes now anyway, because of fanart i keep getting wrong.
When i draw Alois' eyes they often end up looking like Ciel's.
I noticed the difference is in the first line i draw.
Alois' is slightly tilted upwards while Ciel's is straight or slightly tilted downwards.
Also, Ciel has bigger eyes and more and longer lashes.
I hope the tutorial helped.
Also, don't put unconstructive, rude comments here.
If I did something wrong, try to be helpful about it instead.