Hello!
This is something I’ve been working for some hours, is my first try for this kind of illustration and right now, I confess I’m a bit lost and I would like to recieve some feedback or ideas in how to improve it. I was thinking in put some jewlery on her hair and also work a bit the dress. What do you think of it so far? Some new ideas that would help me to improve it?
Thank you very much in advance. 
Not a bad start, here’s a few things:
Your skin tones are a bit muddy. I would adjust your palette to have more warm tones on the highlights, and go more cool in the shadows, especially as you’ve indicated a secondary lightsource on the bottom of her hair “bun”. I would definitely go brighter on the highlights, to pop the volume a bit more.
Your lighting is inconsistent - you have strong highlights along her cheekbone, but none on her nose, or her chest, above the breasts.
The hair could use more dark tones. Not black, but a couple values lower.
Your anatomy could use some work as well - you can define the shoulder structures, especially through the collarbones through the shoulder, and her neck could definitley use some love.
Her face has some issues - the philtrum (the lines below the nose) should come to a point below the nose, and blend into the septum (the part between the nostrils. It’s a tough area to draw, just study soe photos and try and work it out. They also tend to get less deep the closer to to the nose. The nose itself could use a little work, too, in the shapes, and the nostrils are in the wrong place, and there could be more shadows next to her left nostril.
Next up, the eyes - the only time you should be able to see white below the iris is if the person is surprised, or scared, or there’s a reason for the eye to be wide open. The average eye will have the iris slightly covered top and bottom, with white showing to the sides. The shape of her right eye is off, too, the perspective needs some work, the eyelids should be in partial profile, and you shouldn’t be able to see the corner of that eye.
Next, with a flat cheekbone structure, you will have more pronounced lower eyelids, and you need to refine the eye socket more, and refine the upper lid as well. Her right eye is a bit high, too, it could be lowered just a bit.
I would also expand the canvas and add the body, at least to the waist, and add arms and hands. She looks a bit odd without them.
Hope this helps!
One thing you need to work on is your understanding of the anatomical structure of people. Even if you do stylized work, you still have to understand the base in which all stylizations start from, so you can determine just how much to exaggerate, idealize, and simplify. When you don’t have that knowledge, your stylizations will look “wrong” as opposed to being a credible looking style. For example, your character doesn’t seem to have eye sockets, and her eyeballs are flat instead of spherical. The shape of the nose, the lack of cheekbones, the lack of a defined jawline, etc are all showing a lack of understanding of the structure of a human skull. And because your chosen style isn’t completely cartoony such as The Simpsons or South Park, you would have to show some level of knowledge in anatomy, or else the style just wouldn’t work.
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