Apply a light dusting of powder to set and finish your face. Megan Fox does not seem to apply any blush or cheek color at all. If you are unable to pull that off without looking sickly, apply a very light bit of an almost neutral or peachy color. Do not do the whole facial sculpting, make-a-fish-face thing we did in the 80's and 90's. That's out, no matter who you would like to look like!
Lips are a matte, natural color. I don't mean a neutral beige or colorless, but a color that lips actually would be in a perfect world! Remember how our moms used to put on lipstick and blot with tissue? Well, that's what you want to do to achieve the Megan Fox look. You could even get this look by lining your lips and filling in with the liner only. No drippy gloss for this look, please.
The Eyes have it in this look. Megan Fox has beautiful eyes, and whoever does her makeup does not do anything to detract from the natural beauty, but enhances them. No Miss Piggy eye makeup here. No blues and greens and purples, which have made a fun comeback for the younger set. (Remember what Loralei Gilmore said about how great it was when makeup was just for fun, not damage control.....)
You want to cover the lid area with a very light colored, natural shade from lid to brow. Apply a highlight right under the brow bone, but not a stark look. Blend very, very well, until you almost can't tell you have any eyeshadow on.
Her eyeliner is probably the most important part of her eye look. Using black or brown/black liquid eyeliner, create a strong line on your upper lid. Don't take it too far up or out, but whatever you do, don't let it droop down! Remember, think old Hollywood. You want an exaggerated natural look. For your bottom liner, you are going to use a pencil for a softer, smudged look. It should almost be undetectable. Finish with an eyelash curler, and then the longest lashes you can master in black, of course.
Megan Fox has a strong brow. This is something you might need to adjust to coordinate with your hair color. Of course, a brunette can carry off a darker brow. But, you want a well-groomed brow, and then a nice arch. You can accomplish this however you alike. I like to apply aloe vera gel and then use a brush with brown eyeshadow. As a blonde, eyebrows are a particular challenge. I have also found a Cover girl soft pencil in a color called grey/khaki. It is perfect for me, and I can achieve a bold line without looking harsh. If you are a brunette, go a little bolder than usual.