>>1774701QC your work more when you finish. Put a background behind the image that contrasts the main colors in your image. Light green is almost always a good choice to use.
A lot of the hair screams strokes or stroke to path. This is very clear on the hair that had blunt ends, and the beginning tips also show it. Make fills with parallel nodes and handles. Watch/read the tutorials in the OP to figure out how to do it.
For the eyes, use the circle tool. This will remove the chances of lumpyness and make it looks better. Do the same for the highlights. For the bottom eye folds, do not merge them with the eye. It makes it difficult to properly fill, and looks awkward. Make three separate sections. Do the eye first, then do the fold, and then add the eyelash things on top of it. This will also help with adjusting each area separately and save some headaches.
Again, some areas of the clothing show strokes or stroke to path, mainly the collar and the jewel. For the collar, use fills just like I said for the hair. For the jewel, using a stroke is fine, but you have some lumpyness. Smooth out the nodes at the points highlighted.
All these suggestions will probably be a step backward for you, considering fills are much harder to use, but it is necessary in making good vectors later, so it is definitely worth it. It will take a lot more time than this took for you though, so be prepared.