Looks good to me!
I was thinking the same about the blue. I honestly haven't seem much with the use of Neptune. I don't know if it makes a difference but I'm also in the US. Maybe it has been done there and in Europe a lot. This is going to primarily be used for my Youtube channel.Bit late to this but I'd personally go slightly darker on the blue.
I also kind of feel that the trident has been done to death when it comes to neptune/water themes if I'm being honest.
I made the darker yellow as if light was coming from the right. I tried just the bottom left but it didn't look right. Now please bare with the darker yellow. I am partially color blind and can't see small changes in color. So it could be way to dark. I honestly can't tell.Lots better!
Those lines are very light so I think you could lose them without issue, especially at a small size.
I've be a little tempted to try dropping a darker shade of yellow on say the left/bottom instead of the lines.