Ohh! I see you remixed your own style and gave the characters new features and details!
Fox looks kinda the same but he always looked good.
Falco changed a lot, specially his face, I see that you went for his Brawl appearance instead of his 64 counterpart like in past works (or maybe is a fusion of both styles?).
Slippy, wow, he looks amazing now, he looks more froggy and you gave him his 64 3D jacket, his eyes are full of life and cheerfulness , just perfect.
Peppy looks incredible: Adventures spectacles, 64 3D long jacket, younger appearance than in 64, less chubby and a bit taller, he feels fresh and ready fly.
All in all, pretty good. The changes make it feel like it's your own artwork and style now, they are now pretty distinguishable from other artists styles and renditions. Keep that awesome work