To avoid mascara marks, hold a plastic spoon over your eye when applying your mascara so the excess can go on the spoon,and not on your eyelid.
A common mistake that alot of people do is adding concealer to your face first. You should add it after you have put your foundation on, think about it, you are just wiping away the concealer. Once you put foundation on your blemish might be coverd that you don't need concealer!
There are thousands of mascara brands out in the world... But does it really matter? Or is it the shape and size of the wand that matters? I can't begin to explain how many people think it's all down to the pricey product. With mascara it is the shape of the wand you are using.. In my experience the smaller the better, this is simple because it can get to all of your lashes!