I love the way Grandis' eyes are so one day I tried drawing it.
I drew her eye using Samsung Galaxy Note 2's S Note application and here it is.
I used the pencil tool and played around with the colour palette to colour her eye. However, the colours on the palette are limited and it is unable to produce certain shades. Hence, this makes it difficult to obtain the colours for the skin shades. What can be done is to manually mix the colours by overlapping one colour over another. Then, use the colour picker to pick the mixed colour.