Colored pencils are generally not suitable for use alone
Mainly because they are too light in color
They don't appear three-dimensional
Repeatedly applying colored pencils will make it look too cluttered
If you then enhance the shadows with black colored pencils
It will make the picture look dirty
So it's generally better to use it together with a marker pen.
But
there are many ways to express yourself
I suggest you try more different ways to express your work.
Can use watercolor, gouache, drawing, ink dots - and so on
Input the design expression techniques in Baidu and you will find a lot of new discoveries---
(*^__^*)
Heep hee