The wig does look expensive and nice, but hair that perfect is usually only seen on a young girl or a movie star.
Also, the color doesn't match up with your skin tone and eyebrows. I'd try a medium chestnut instead, and a cut that's not so.... young and perfect.
The eyeshadow isn't flattering your eyes, and the lipstick is way too bright and intense a color.
Try very, very pale cream on your eyelids and a very, pale lilac under your brows (or a medium taupe if your clothing is in the brown family). Try a light, pinky/peachy lipstick with plenty of shimmer, and a light, matching blush. Don't forget mascara.
You also need a bit more cover around the eyes, but be sure to blend.
But there is possibility! Very much so. I'm not saying you should try for a "old" look, just one that's believable if you really want to pass. You have nice bone structure.
One more thing-- only someone in PERFECT shape can get away with wearing that dress. I couldn't. If you're a wee bit too heavy for it, it attracts stares. You should at least have a nice tan if you want to show all that skin.
You're making the same mistake many CDs make (and GGs) of trying to look way too young for your age, which only ADDS to bringing attention to yourself and exaggerating "flaws".
You should think "Ann Taylor" or "Liz Claiborn"--- chic and stylish, not "age thirteen tart".
Well, you asked. I only mention it because you seem to want the truth and have the motivation to look your best.
How about a look like this?
or
or
I like the bottom one the best---sexy and believable! You'd look like a million bucks!
Good luck!