The shade and placement of the eye shadow are two big factors when it comes to tackling darker colors. I really struggled with it when I was beginning my makeup adventure, but I have it down pretty well now.
If your eyes tend to appear smaller, then you may not want to line your whole eye with black liner and eye shadow. Instead, focus your darker shades on the outer v shape of your eye so that it pulls your look up and away from the center of your face. Personally, I add a bit of a highlighter to the inner corner of my eyes to brighten them up if I'm going with a darker look. Also, with eyeliner, you may either want to just put a peach color on your lash line OR put a little bit of a darker shade in the outer corner of your lash line. I like to use a smudge brush and lightly smudge it into the little bit of eye shadow I have under my eye.
As for the actual shade, some colors compliment some skin tones differently than others. If it's easier for you, I'd love to see a photo of your eyes to help you out some more if none of this was helpful.