Nyuu Lines -Colored-

nice work! you're doing nothing wrong; this is well-colored, particularly for a first attempt. i wish i could offer advice, but i sadly have a stone age paint program that no one else has and i don't know any others. however, i can tell you that if you pick a light source and shade the character based on that, good things will happen! depending on how your program works, it might be a good idea to "block" the areas of shade and highlight by drawing lines and filling in the fields with darker or lighter versions of the same color--that's basically what i do.
anyway, you picked really nice colors to use and applied them effectively. that's a win.