Hi there.
I made an edit for you.
It's only the head and chest area I edited.
Though the idea is very nice, the execution is currently lacking a bit. One of the things that stands out the most to me is that you seem to want this to be TOO smooth.
In pixel art, there's often no room for this since it's at such a small resolution. You want everything to look well defined and readable. That is your first priority. After that you can smooth things out.
But still, you don't want to loose any of that volume or readability because you smoothed it out too much.
One of the reasons that it looks so soft, and lacking in contrast, is the amount of colours you used.
ProMotion counted a whopping 100 colours!
This is far more than you'll ever need in pixel art. In the largest of pieces you might need 64(And even then, a really complex piece. Such as
http://www.pixeljoint.com/pixelart/6661.htm), and in mockups you may find more sometimes because of a lack of optimalisation.
For a pixel art this size you will never need more than ~32 colours.
You have so many useless colours in this! And with useless, I mean colours that you can't differentiate from one another.
There are many colours that are practically the same, but just a teeny tiny bit lighter. This is unneeded.
Try to use as little colours as possible. You might even be able to make this look better with as little as 20 colours or so.
You also seem to put too much effort into the textures, before you've created the basic forms. And in this way volumes are obscured. Which makes the whole piece look flat, and dull.
You seem to have tried some secondary lighting, by letting that light from the fire light the underside of her breasts. Though correct, it's too much.
Just a subtle line as I demonstrated in my edit suffices. It's also alot less light than in your version. Because the light does loose some of it's intensity when it hits that cloth.
On metal it would probably be the same colour, but on a matte surface like a dress, it would never remain it's original intensity.
What I suggest here is that you study some pixel art upclose. Discover what makes it pixel art.
And I also think a volume study wouldn't be out of place here. Study how light falls on an object, and what it does to the form, the contrast and the overall appearance of the object.