The other thing to remember is that you dont have to have dramatic color's up to your eyebrows to have, "girlie" MU on. I dont think anyone on a day to day basis can pull that off.
I think we've all gone through the phase your in right now, obsessed with bright colors, and out of control makeup. I know I did (still am to a degree), and it's totally fun. The first colors I bought were hot pink and an electric blue (wasn't MAC, although i own Electric Eel and Sushi Flower lol). But I also think learning how to use those colors for an effect thats wearable makes you an even better MUA. Dont get me wrong, i love over the top MU (like the rainbow butterfly wings my friend had done for her rave) but thats not something I'd wear to work, it's rave makeup.
Obviously your mileage may vary, but for me, I love makeup that incorporates bold colors, but does it in a subtle way. I know I'm doing it right when I get compliments from women at work who wear little to no makeup on a daily basis, and questions about how I did it. Because I know it's bold, but also classy. Doesn't mean i wont wear pink on pink on pink for a night out though