Here's one with a Violet-purple Coronet.
It's easy to forget how long hummingbirds' tongues are...
Both the brilliants that I've encountered have a rufous wash to the malar in young males (Green-crowned Brilliant does as well).
This next bird is a female brilliant (note the whitish malar mark) and the speckled throat. I'm pretty sure this bird's tail is long enough to be an Empress, though it might just be a Green-crowned perched at an odd angle.
Here's a for-sure Green-crowned female for comparison.