Just because you're at work and need to be professional doesn't mean you have to look dowdy. There are great professional clothing styles and great professional shoes and you can also have great professional makeup. While makeup for the workplace may have to be more understated than statement making, it can still look beautiful and still look professional. Make up your face for success!
The biggest thing to remember in the workplace is to keep things professional—in your dress, in your conduct, in your relationship with your coworkers, and in your cosmetic presentation. In the workplace, professional means more toned down and more understated. Wear colors that are natural and that blend in more with your natural skin tone. Light pinks, golds, and browns are all good shades of eye shadow to wear. Eyeliner should be natural browns and shouldn't be too dramatic. When you use blush don't overdo it and use it to make you look lively rather than scary. Too much makeup just isn't appropriate at the office.
You could probably even get away with not even applying eye shadow at all and use eyeliner and mascara to make your professional statement. I wouldn't suggest avoiding makeup all together, because you want to ensure a polished, sophisticated look, and with most women, that means at least a little bit of makeup. Use foundation to even out your skin tone and use minimal eye makeup to achieve a professionally flattering look.
Makeup at the workplace accompanies dress at the workplace, both of which again necessitate a toned-down appearance. You need to dress appropriately and make up your ace appropriately. These two facets of appearance go hand in hand with presenting a professional attitude. If you wear revealing clothes with toned down makeup, you still won't be professional and if you wear understated clothes with full blown makeup, you'll still look inappropriate. The office is not the place to make a dramatic physical impression—your coworkers and superiors should be impressed with your talents and abilities. This is the place to make your other, invisible assets shine!