>>4797151You cant use hard wax pencils from the grocery store to make colored pencil illustrations. Especially the realistic ones you seem to be going for. Prismacolor, Faber Castell Goldfaber and some of the more professional oriented lines are what your after (many of them "oil-based") are what youre after.
You absolutely can layer pencil, but you cant go all-in and burnish every single pencil stroke by pressing hard onto the paper.
Also, a lot of newbies handicap themselves by trying to make drawings on slick copy paper. The pigment has nothing to grip onto and layers will slide all over one another, making mud. You need rougher, mixed media paper at the very least.