I recalled my own childhood, when I wanted anything and everything I created to be perfect, whether it was my school work, artwork or writing. Perfection was such a goal that I often tore up anything that did not attain my idea of perfection. In frustration, I believed anything less was garbage.
Fortunately, as I've gotten older I've seen that true creativity is imperfect. If artwork is to be perfect, why not just take a photograph? If writing is to show a reader the human condition, then surely it should not be flawless.
There is beauty in the imperfection of creativity, and it should provoke a variety of thoughts and emotions in its beholder. So, go ahead - color outside of the lines. I've learned (and am still learning,) it makes life a whole lot more interesting.