Canon: Skywings with firescales have blazing blue eyes
Canon I'm willing to ignore: Only SkyWings can get firescales (and there are no similar conditions for other tribes)
Headcanon time! HiveWings: Can be born with too much venom, called Venomscales. They are often much shinier than other dragons. Queen Wasp loves them, as they are very good at terrifying.
IceWings: IceWings get Icescales, in which they freeze anything they touch in a layer of frost. This leads to frostbite very quickly. They have bluish veins along their scales. Icescales and Firescales cancel each other out. LeafWings: Treespeak is an advanced form of Leafspeak which does not require any focus; rather the plants are more drawn to the dragon and react at even the slightest thought. These dragons are often covered in various plants that try to make themselves at home on their scales. They do not mind this.
MudWings: It’s rare for a MudWing to be born with firescales, but when they are they prefer to stay submerged in mud. MudWings also get blue eyes, but darker. Ocean instead of sky.
NightWings: Instead of having coppery veins in their wings, their ‘stars’ take on the coloration if they have firescales. Their eyes are almost white, as if they’re about to start spouting prophecies at you. RainWings: Can also be affected by Venomscales. Their scales are black with an iridescent sheen, and they can only turn dark colors. Their eyes are also black. SandWings: SandWings can get Firescales and Venomscales, though the latter is rare. A firescales SandWing has bluish-white eyes, darker golden scales, and coppery veins. Venomscales give the dragon a slightly greener tint. SeaWings: SeaWing glowscale development has a chance to get out of control, and as a result they may be able to glow all over their bodies instead of their stripes. Glowey bois. SilkWings: SilkWings may have ‘silk-scales’, in which the silk glands form all over the dragon. They sort of... ooze silk, usually uncontrollably. Flamesilks can have a form of Firescales in this way. This also makes Metamorphosis slightly easier. SkyWings: See Canon.