Come again?

Sorry to say, I don't use Copic Markers. I use Faber Castell Markers. If you want your art to be vibrant, and bright, go w/ for Faber-Castell markers. They're less expensive than Copic Markers, and they are just as awesome! For outlining your character and such, start out w/ "Faber Castell PITT artist pens". Get a 5 or 6 set of those pens, and they will have different sizes. After mastering the technique of lighting, and how thick you have to make the sides of a characters body part (or something), go w/ "Sakura PIGMA MICRON pens". They are a little more expensive than Faber Castell pens. Pencils, I use "Faber Castell color pencils". These are SO awesome, they helped me make this [link] . These are somewhat expensive, but they are REALLY worth it! Crayons, I don't actually use that much, just colored pencils.
Also, to make your art "good", you just have to keep practicing! Hey, I am not "the best artist that ever lived". I have flaws as well, most of my art isn't "perfect". Everyone has their own style of art, and the way they draw it. For example, is like 23 years old, and it took her like, 17-19 years to be as awesome as she is right now! And ! She is 23 years old, and it took her jus as long as ! All these people here on deviantART are older, more experienced people who want their art noticed. They keep drawing, even if it's sketch dumps, or scribbles, they are still drawing! So, to answer your question about making your art "good" isn't about fancy markers or pencils, it's about the time and effort you put into the art you make! Art is supposed to be fun and happy! It took me 9 years to get where I am today, and still working on it!

*If you want some tips to drawing and coloring here are some of the few I look at; [link] [link] [link] [link] [link] [link] [link] [link] and here [link]. These might come in handy when drawing as well! Your art is adorable! Just keep practicing and you'll get even better! Hope this helped!