The important this to do here is keep on adding clusters of beads along the whole length of the chain. I have covered wire wrapping in greater detail here in my wire wrapped necklace tutorial, check it out if you have any trouble. Hold the earrings up as you go and see where there might be an empty spot to keep the earrings balanced.
Here is how I build up my clusters. The goal is to have a fullness without getting clunky. Enjoy!