Limiting the palette on each work

I've seen the gamut in color pencil works online - those that throw every color of the rainbow in and those that seem more studied in limiting the colors used. Fine, I guess there's no "right" and "wrong", but I wanted to give the latter style a try, as an exercise in picking the colors that work together and yes, discipline as well.

The following works are the result. (The hedgehog got several "likes" on my Instagram feed.)

Hedgehog with autumnal palette of leaves. All earthy shades.

A palette of cool blues and blue-greens, with white flowers
 (my favorite!) and some chartreuse accents.

Browns for the squirrel, with red bits in the tail for accent.
The plants were kept to an autumnal palette that played off the
browns on the squirrel. 

There is really no need to go hog wild with color all the time. A little restraint is good as well. I've seen entire pages of leaves and flowers done in only white and blues, recalling the splendor of Ming vases.