I think it looks bright because of the white background; if it was black, it would be less painful for the eyes.
Now, good attempt, but the colors are a mix of "whatever". You really should make them follow a pattern that has an artistic and realistic feeling to it. She is not a troll-type warrior to have so many colors. Balance them with only tones of blue for example and in the places you want to add contrast, add some other color of your choice, but don't paint each part with such a color variation.