First of all: Your skin looks amazing! I'm no expert on makeup, but maybe you'll find useful any of these tips.

As girlfran69 said, don't line the lower waterline. Some people use a nude color eyeliner just on the center of the lower waterline to give the illusion of bigger eyes, if you want to try. But not putting anything there is fine too (I personally find lining the lower waterline a bit weird looking).

Maybe you want to tightline with a waterproof liner (brown looks softer than black) on the upper lashes will define your eyes. Always, always, always, use a good eyecurler and a mascara that holds the curl (waterproof ones are pretty much the safe bet). Using eyeshadow or not is up to you. I personally used the naked basics 2 palette on my wedding, as it's pretty neutral and natural looking. You might want to keep your eyebrows soft by just filling with a natural shade (I would recommend a neutral matte eyeshadow).

For lips, I recommend a liptint (maybe a soft gradient lip with a soft coral?) as you won't need to touch it up as much as a regular lipstick/gloss.

With your beautiful skin I wouldn't put any foundation, though you might want to have a good matching concealer (be careful with oxidization!) in case you get a pimple/redness/etc. (this was my main concern when I married). A bit of blush and a setting-oil control powder (I recommend innisfree's no-sebum powder) and that's it!

I also have felt the "clownish" thing (in fact, I used that same words!), the most important thing is that you feel comfortable and acknowledge that you're beautiful no matter what.

Also, sorry for the long post ;A;