I like it, even if in fact red is my least favorite color.
The red & bits of blue go together nicely, and I like the lighting effect overall. However, those grass-green PSU connectors don't fit the color scheme, IMO. You might want to paint them black or red.
I've also spotted some nice stuff in your pics that isn't mentioned in the specs (like the SSDs), please tell us some more about what's inside your case. As for your GPU, I have the same one and it really is a great card. It's not noisy, stays cool and is one of the few to provide six display outputs. I've had no troubles at all in the 3 years using it. I'm sure you won't either.
Cable management is good, you might want to remove that white label on the PSU, though. Or try some of that fancy "carbon" material to cover the PSU. Or, just paint it black.
So what if your case is "half empty"? That's good airflow/cooling and lots of space for adding new hardware! I own a large case as well (which was also "half empty" at first), but now is full. This is not the "Laptop Mod Gallery" after all.
Overall, even if the colors are not to my liking I think you did a very good job. What's matters most is if you are satisfied with your rig's performance and that you are proud of your work. It's all that matters!
Thanks for sharing!
H7