tikal the echidna sonic advance style

[Iocus]

I don’t understand why the upper edge of the skirt needs a better outline, can you explain?

Yeah, sure. the skirt is an object independent from the body, and it's overlapping the body. To show that her belly and her skirt are not on the same flat plane, I marked the boundary better. I tried using black, but it was a little overkill, so I used the second best thing (the grey shade). At this scale, it might not even make much of a difference hah hah, so I do wonder how effective it is.

I would advise against that stuff you're doing on the tiara, it makes it look kind of blurry.
Here are some possible alternatives you could consider.

I also think you could put a pixel or two of the yellow's darkest shade on the right side of the necklace, to help it stand out a little more.