>>46829832Not sure if you're still looking for tips, but I'll throw in my two cents anyway. My example is a bit rushed and I'm not much of a teacher, but I'll try to explain the best I can.
1.) Adjust the base colors so they have more harmony. Hard to explain the theory of this in just words, but even the "worst" color combo can look good when the values and saturation are adjusted. I don't think the green itself bad, just too de-saturated and dark. The colors used are still unconventional and might not appeal to everybody, but it's possible to use these colors and have it still look good. Another thing is the cape against the legs, the colors are too similar and blend into each other. I bumped up the saturation and brightness of the cape and changed the hue to be slightly more pink.
2.) Adjust the shading. Give the shading more saturation and adjust the hue so it adds contrast against the base color. This will prevent your design from looking muddy. (There are exceptions obviously, but since you said you liked bright colors, I wanted to keep it that way.) Add deeper shadows for objects that get less light. For example, the neck has a base shadow because it gets less light, then add a secondary shadow for where the head covers it. Did this with the legs as well.
3.) Color the line art. The shading is relatively soft, the lines are thin, and the colors are bright. Black lines will make the model's parts feel separated and disconnected with this art style. Similar to what we did with shading, adjust the hues and value of the lines (if you still have the original file that still has separate line art, just adding a clipping layer and mess around until you get something you like)
4.) Just a personal preference, but I added the cross hatching that's on the bottom of the cape to other accessories to add more unity.
td;dr Saturate and add color to the lines and shadows
Again, I didn't want to change too much because I don't want personal design biases to get in the way of what you want for your model. Design is very cute and I like the (´・ω・`) hair accessories btw. Also I'm not rereading what I wrote so uh...hope it's understandable.