>>1885404>>1885435For your lineart, keep it consistent across the image. Even though you are dealing with an image that has a bolder outline around the character, you don't want to deal with something like that until the end. Instead, pick a consistent thickness for each area and match it. Make sure you give every node a handle or a pair of handles, and keep those nodes and handles parallel at all times. At the end, you can make a copy of your Lines layer, place it under the rest of your layers (besides the Model layer), unite the lineart, and then go to Object > Path > Offset Path and increase the value to create an outline on the outside of the image. This way, your lineart will be consistent with the outline off, while still being crisp with the outline on.
For the circle on the top, use the circle tool and increase its stroke value so that it maintains thickness. If you're going to use blurs for the eyes, make sure you increase the quality of them. Go to Effect > Document Raster Effects Settings and set the Resolution value to High (300 PPI) or Other and set it to 600 PPI. Note that blurs are raster effects, so try not to overuse them in future vectors.
The gradient for the blush is very poor, with the inner and outer colors being too close to each other. Set the inner color as the pink, and the outer color as the skin behind it, and then spread the distance between the two so that it looks soft instead of harsh. Looking at the original, they appear to be solid fills, so I would leave them as such. For the mouth, keep the lineart consistent (including the coloring of the fill itself), and don't forget to add in the mouth coloring. For the neck lines, have them taper off into a single node.
As a final note, make sure you are exporting as Type Optimized (Hinted) for the aliasing.