A couple things to remember before doing a dark look is fallout. Fallout is when access eye shadows falls on your cheeks while doing your eyes. When working with black the fallout can be quite messy.
A couple things you can do to prevent or limit it...
- Make sure to tap your brush to get access shadow off.
- Apply your foundation after you do your eyes so you can just clean up all the fallout right after doing your eye.
- Apply a generous amount loose powder under your eyes to prevent the fall out from sticking onto your skin and just brush it of with a soft fluffy brush.