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"It just gets bigger" is one of the biggest problems with fakemon. Differentiate between evolutions to really make the growth in strength more apparent. For example, look at Chespin -> Quilladin -> Chesnaught. Each form looks very different from each other. It also helps if you can put a clear form of progression in there, like Bulbasaur's bulb slowly blooming into a flower.
Another thing is animal + type + fakemon. It's always better if you can add an interesting concept to it. The Fennekin line isn't just fox + fire, there's also the witch aspect to it. The fakemon in OP is great, because you can see the concept was well thought out, even adding some more information to make the fakemon more 'real'.
These are water starters I've been working on for a while now. Starting with the concept, I wanted them to be based on Selkies from Irish folklore: seals who were able to transform into humans.
Immediately there was a great opportunity to differentiate between the three forms, making the basic look like an ordinary seal, and making the evolutions progressively more human-shape (but still obviously being an animal, I don't want to get into uncanny valley). I tried to give the final evolution a differently colored lower body, to kinda give the impression of pants, alongside the white seal skin (which was pretty much the entirety of the first form) becoming a scarf. I also gave the scarf spots to resemble ermine fur that was often used in the clothing of royalty. I used these clothing-like patterns to hint at the human transformation.
As for the middle pokemon, I tried to find an interesting middle ground. I tried to make it look like a seal that suddenly sprouted legs, making it look kinda out of balance and trying to come to terms with this development. I also added a vest-like design on its belly to hint at the transformation into a human. It looks very different from both the first form and the last.
(water -> water -> water/fairy by the way)
