Amethyst

Simply beautiful ^^ the colors are so vibrant and she look so cool.
Although there are some points I wanted to point out, sorry in advance for any typo or grammatical mistake, English is not my native language but I will try my best! 

First, I wanted to point out the LineArt, in here the Line Art are too "hard" and "tick"
Drawing line art isn't as simple as simply laying down some lines. There are a few critical areas that you should keep in mind while drawing, which I will cover here. The first, and absolutely most important thing to learn about drawing lines is line quality.

Lines have thicknesses. It's especially important when doing line art, as it expresses weight, motion, and depth. With it, your line art comes to life. A thinner line indicates delicacy, while a thicker line indicates solidity. Likewise, thicker lines also feel heavier than thinner lines. They can also be used to express motion. Thin lines give a sense of movement, while thick lines do the opposite.

And the coloring... it already look good, but it will be more perfect if you add more details, like combinate cell shade and soft shade.

If you still confuse, you can try to search some tutorial in google, they sure more helping than me x'D
Overall your drawing are so good, and I hope you don't feel upset about my words
Keep it up you great work!

- love,