You've got a lovely style here! I really like how you soft shaded Duosion; he looks nice :D Makes me want to digitally paint more, which I haven't been doing as often lately.
Armiatsu is also very adorable~ Really like the concept, armadillos are one of my favorite animals so I'm glad to see a fakemon based off of it! :3 Though going by the sprites, its arms should be a little shorter in the picture. That and the whiter tummy part seems to be a bit lower on the concept art than the sprite, not really sure if you were aware of that or not, though. ^_^; As for the image itself, there's definitely a little issue with the forearms (mainly due to how they're bent/curved) and claws. I'd include a bit of a "space" inbetween each claw and change around the sizes so they're not identical to each other and see how it comes out.
And ahh, Tegaki! I've heard so much about it but have yet to try it. I love the Mew you produced using it; creepy but still quite cool. The thinness of the arms and legs really turned out well.
I really hope to see more from you, so keep us updated! =D