I made a few edits I think makes the doll look more feminine and cute.
Resized mouth, ear, nose to be more petite. This is mostly based on my experience with anime and manga.
Also added the eye reflection and added some lashes.
I suggest you don't try to make it look to realistic, it's better too skip out on some features, like nostrils for example.
Especially considering it's pixel art, but also because it's more important that it looks cute than real (I assume that's what people using these sites want
)
(I suck at ears btw)