Well, you do look lovely. Especially when you smile, as those lines instantly turn into laughter lines.
I think a pale-mid pink (not glittery, more on the reddy pink than orangey or bluey pink) lipgloss or lip crayon would work very well.
Quick sweep of a light brown eyeshadow, a darker/chocolately one close to your outer corners if you have time/the inclination + a bit of brown/black mascara would give you a lift. A light/blonde eyebrow kit (the type with a wax and a powder, rather than the scary as hell looking pencils at first) would also make a noticeable difference; yours are a good shape, but a tiny bit of thickening the outer winged part wouldn't hurt.
It's all very well suggesting foundations/BB creams and eyeliners (chocolately brown would work, but not essential), but if you don't normally wear anything, it could become too much of a faff after the first couple of times. With one shadow, mascara, a quick dab of eyebrow pomade (yes, I have just remembered what the stuff tends to be called) and a dab of lippie would take roughly 240 seconds - 4 minutes - and would make you feel good.
Other than that, the money you save from not smoking would soon pay for you to play about and find what makes you feel your best (even if that's actually a new mattress - my current #1 wish in the world - rather than a fancy haircut or facial - but, if you don't need a new mattress, I'd suggest having your hair done so that it feels good to have it loose when you're not at work.
Keep smiling though - you look exactly the type of person I'd want to see if I were at what appears to be your place of work!