Definitely. Colouring isn't as easy as picking a colour from the default swatch collection and calling it good. There's tone, hue, contrast, and colour schemes (triad, monochrome, compound, and complimentary). Then we have to fight against all the simplistic stuff we were taught in elementary school about the sky being blue, trees being green, etc...
There's too much to unpack here, but there are solutions. I'm definitely planning on explaining colouring in my comic for this exact reason, but someone requested I talk about perspective first, which is just as complex.
In short, art is weird, and we have to teach ourselves to see things as they are, not what they seem to be.