I wanted to create a Charackter in honor of Scarlet Briar. So I came up with the idea with a Charr that adopted Scarlets technics after she died. The lines of the warbeast armor should imitate the lines of the Gun "Scarlets Kiss" which I'm also having as my engis gun.
But overall I'm not sure with the color scheme of my Char. There are also pictures of him with a more green schemed armor (on that one I'm also not sure if it isn't too green).
The initial images have a better color scheme than your last two. Your greenish look makes me think your weapon decides what dyes you should use, not your armor.
Personally, I try to avoid coloring my characters based on their weapons, but rather fit the weapons based on how I dye the armor pieces for that character.
Now, as for colors... Scarlet uses a reddish theme: https://wiki.guildwars2.com/wiki/File:Scarlet_Briar_(hood).jpg
So I would say explore that spectrum of colors, but also be critical: the charr is your character, not a copy of Scarlet Briar.
Hope this helps :)