@Carmilla:
I know that, but when it's about your favourite characters you want to make look like they really are (at least expressions) it becomes kinda different.
No it's not. You are afraid of your imperfection more, because you care more and thus you inhibit yourself more. But that is not the whole story. If you are afraid and that stops you from drawing, that means your fear is stronger than your love. To be afraid of drawing beloved characters is like to be afraid of being together with people you love. You're scared of your your own imperfection, you are scared that picture you get won't be as good as you wish. You are scared of possible screw up. Guess what, like in relationships, the are always going to be screw-ups and imperfections. But if you are really loving strongly, you will always work over those to make the better picture next time. You don't need to shy away from those you like and draw them. If you love them, you don't owe them perfect picture, you owe them your tries, your frustration and overcoming, your joys. Do your best, perfection isn't your best. Perfection is no ones' best.
Don't give up so easily. You love them right?