Whoa, so much stuff since I last checked in!
There's too much to comment on individually, but some general things. I'd agree with Alch to keep your lines smooth. I'd also be cautious of awkward shading (Pikachu's forehead, the moon above Claydol, etc.).
However, those said, I still love your art, Ritter! Recently I'd felt like you were getting away from the style you'd always done, but with these last few pieces you've been getting back to your roots sorta, and I like that. Stick with what works. Go for what makes you great. That sort of thing. Good job again, bro. :)