>>1908418>>1908454>>1908475>>1908482I absolutely disagree. Your coloring went from dark orange tinted coloring to very pale white tinted coloring, with one being no better than the other. Anime screencaps are notorious for having a white tint over its coloring, making them a poor and pale choice for coloring. Your best bet is to find fanart with more neutral coloring. Then, you make smaller adjustments to Saturation/Brightness in the HSB scale. This of course comes with practice, but is absolutely required.
While official art may be easier, it's also simpler in its design. Fanart gives you more options in terms of styles and personality than official art can. This may hold less in minimalist images, considering you lose the face (which makes the image lose any character), but you are still hampering yourself if you ignore fanart due to "difficulty." This image was hardly difficult in terms of its lineart and is actually good practice in how you may need to make adjustments to make it look crisper and cleaner, which applies even to anime screencaps.
Getting on to what your image lacks, the biggest issue is the lack of direction and flow for the hair. The tips are flat and stagnant. You need to use the handles at the tips of the hair to curve them in a certain direction so that the hair curves and flows properly. For the eye on the shirt, you need to properly match each part of the eye so it flows properly from top to bottom. The top eye is also supposed to be a darker color. The left stripe should be under the strap, and the right stripe should go to the skin.
Overall, it is better than most first vectors, so good job. Do a couple more with these principles in mind and you should be well on your way to making good vectors.