A great tip I can give you is that you should take care of your eyelashes the same as you would a bonsai tree. Pay good attention to them, keep them in good health and they will grow vibrant and long and will do wonders to your eyes as a reward.
I always advise my friends to go with a combo of both an eyelash conditioner as well as a lengthening mascara for the dramatic effect. You apply the eyelash conditioner every night before you go to bed. Keep this up for a good 2 months and you will notice a growth in lashes. Now, when you're looking for that extra effect, apply some lengthening mascara now and then and your lashes will really pop out, creating a beautiful look.
Example products that I love are Revitalash Advanced for conditioning and LashFusion XL for the dramatic lengthening effect. You can read more about it here: