All of your evolutions just look like bigger versions of the previous ones - they're all the same exact colors, too. Official Pokémon evolutions always look distinct enough to be considered a separate species - for example, Pikachu is pure yellow, but Raichu is orange and has a white belly. Scyther is green and turns entirely red for Scizor. Magikarp, a red fish, turns into a blue dragon. Dragonair, a blue snake-dragon, turns into a bipdal orange dragon. Green Larvitar turns into a grey rock-cocoon thing. Snorunt's only connection to Glalie is its teeth, and Snorunt's only connection to Froslass are the lines on its coat. Fraxure, a green lizard thing, turns into scaly gold Haxorus - you get the point. What I'm saying is I think you ought to make your evolutions more unique - yes, there are some official evolutions that look very similar to the previous, such as Muk or Klinklang to name some obvious ones. But the more distinct evolutions far outnumber the similar ones, and so far all of your just look like bigger or "Mega" versions of the previous evolution.
I appreciate the input. I do get that I used the same colors for each line, so maybe I could change that a bit, but I have to disagree with all of them being "bigger" versions of their predecessors. The Arumin line you might have a point, but Fairthy goes from a fairy type Pokémon, to a flamingo, to an ostrich, the only thing similar about them being that they are birds and have the same color schemes. The Sphrite line has some variation imo as well, and we know what the Glarvae line is about.
Also, I'd argue that at least 50% of evolutions are essentially bigger versions of their predecessors. And I don't believe that having an evolution that doesn't really look like it's an evolution of its predecessor is actually a good evolution. A couple of the evolutions you mentioned are my least favorite
because they are so different from their predecessors.
I've thought about going with different colors for some of the evolutions and I might change some. But I'm still more interested in getting the sprite designs right first. Then I can go back and mess with the color schemes if I want to change them up.