hmmm well. i don't really see and problems with your style or how you;re drawing these. tbh whats REALLY getting me is the designs.
individually, they're pretty nice. together... they need work.
TBH, you seem to have got it right with Mayribbons evo line and your absol pre-evo. what i'm getting at is that the evo lines besides these, as an entirely are pretty well. okay i'll be blunt.
they're bland. they don't change much at all besides getting bigger and their eye design changing. Now, i KNOW evo lines look SIMILAR, but look at Pichu Pikachu and Raichu, for a good example. YES they're similar you can see they instantly come from the same family, but look how much they change BESIDES getting bigger! yeah, you've gotta see what i mean, right? you need to strip the preevos as somethign dull, tiny,little, basic. the basic physiology of what its GOING to be. lttle or few marktings denoting relatedness to the final form. they are basic!
But then after this, add brand NEW parts to it that weren't there before, yes make it bigger, it's going to be stronger, right? but theres alot mroe you can do with somethign then making it bigger and more seriosus looking. I mean, yu kidna got it on the electic ones tail... don;t be afraid to do something unpredictable in an evo line. it will make it more interesting. i mena, look at trapinch and flygon? how different are they?
i hope you see what i mean and take soemhting away from this. what you have now is certainly showing promise, ALOT of promise. yu just need to not be afraid of soomething different and new. good luck!