The Straight Brow
While this may look amazing on the runway, anything that alters your appearance dramatically in leu of a trend is never a good idea. Eye brows are like the nipple of the face - if they aren't working, nothing is. Everyone's eye brows are a different shape, and they're already well suited to your face. I always recommended sticking with what works for you - don't feel like you need to change something about yourself just because magazines are telling you to. If you have a naturally straight brow, rock it - if you have a naturally arched brow - embrace it. Trends come and go, and the last thing you want is to be stuck with a pair of eye brows you hate for 6 months.
Shaved Head
This is another trend I recommend avoiding for similar reasons as the straight brow. First of all, I personally don't like the look of a shaved head, but I also think it's a HUGE commitment. While having the side of your head shaved might be all the rage right now, you have to realize it could take 5 years for your hair to grow back to the length you want it. If you don't have any emotional attachment to your hair and don't care about that, go for it - more power to you. But if you're looking at the shaved head as a temporary fashion statement, go for something a little less permanent like braiding one side back.
Overly Lined Lips
Kylie Jenner has turned the makeup industry upside down the past year with her famously over-lined lips (which she didn't only get with the help of a lip liner if you know what I'm saying). Overlinning your lips is like filing in your brows, a little bit can be fabulous, but too much can get out of hand. If you want to make your lips appear larger, overline the cupid's bow slightly. If you get too heavy handed, it goes from sexy to clownish in seconds. If you want a more permanently plump pout, any plumping lip gloss should give you a little something extra - OR you can go the Kylie route and get a little Juvederm. It is after all temporary, and if you like it, that's all that matters. As with most trends, moderation is key.