In this simple tutorial we will learn to paint anime eyes using multiple layers in Clip Studio Paint (CSP). To simplify the explanation and avoid drawing the eyes in perspective, I created a drawing of an anime character seen from the front and using the symmetrical ruler function ("Symmetrical ruler") of CSP.
First of all we will draw the base of our eye that consists of 3 elements: the sclera (white part of the eye), the shadow cast by the upper eyelashes and the base of the iris. Use a layer for each part and do the same for the rest of the steps.
Next, we will draw the sclerocorneal limbus. To do this, we create a selection by left clicking on the layer corresponding to the base of the iris while pressing the "Control" key (Ctrl-LMB means "control and left mouse button"). By the way, if you don't see the "Selection Launcher", you can enable it in "View> Selection Launcher".
To draw the pupil I used the selection tool "Ellipse". In this tutorial, in order to focus on the necessary layers, we have drawn the eyes straight ahead. Thanks to this we can simply place the pupil in the center of the iris. In case you draw your character from another point of view you should consider the concavity of the iris and the pupil.
We continue with what is probably the most interesting element of anime eyes: the iris. To select the region of the iris I show you a little trick. First create a selection from the base of the iris using Ctrl-LMB as we saw in previous steps. Then, use Ctrl-Alt-LMB to subtract the regions corresponding to the limbus and pupil from the selection.
This step is optional and involves coloring the lines of the eyelashes, eyebrows and the crease of the eyelid. The method is simply to create a new layer on the lines and use the "Clip to Layer Below" option so that we do not paint beyond where we want.
Although this tutorial has focused on how to paint anime eyes, consider the importance of eyebrows in the expression of your character.