Hahahahah! The Power-Rangers-Marco reference is gold!
It's coming along well, QIfry! Maybe you should become a colourist if you're having fun!!
But just a few constructive enquiries, are you using the book covers as a reference, though?!
How does Ax have that grayish-patch in his hands and in his front and at the tail? His blue should be a lighter tone, to mimic the blue-and-tanned-fur he's described in the book. And isn't Marco's skin tone slightly darker than Jake+Rachel's, but lighter than Cassie's?!
And the way you did the Tobias/hawk is really cool.
To push this drawing, I think it needs a light source. The one you've made for Jake and Cassie seem to work out. But it would mean fixing up the other characters to match, and making parts of the shadow areas significantly darker. It would work out!!
You're both the only ones who have shown any colouring so far!
So two thumbs up!! Great job!!!
