Princess Yoona?

my third attempt at realistic drawing
i don't really like how the neck down turned out

at first I wanted to make Garnet from FFIX but I dunno anymore based on how it did not look like her
I used Yoona SNSD as reference (she looks pretty)

I am still a beginner at this and by that I mean no one is teaching me in art so I am walking blind here. So instead of just criticizing my works, I would prefer that people give me tips or how I can improve on my skills