I think you did a great job, it’s super clean and I’m confident that just a little bit of motion and interaction could really set it over the top!
Personally, I’m not a fan of transparent headers once the scrolling puts the body text through the logos and nav buttons. Your’s looks awesome onload especially with the dark image in the background, so if you’re looking for a suggestion I think you should find a way to minimize or darken the whole nav, or increase it’s opacity after scrolling to kill the busy looking text overlap in the body. If you want to keep the “look” of luminous dimension even when the opacity is 1; I’ve found that can be achieved with a subtle background-image linear-gradients.
Keep rocking it!