Scyther and Mewtwo are both in my top 5 favoruite Pokemon! You have good taste. ;)
Both of them look very cool! I absolutely love Scyther's pose - I find the mantis really hard to draw and pose, and this one looks very active and intense, especially with the perspective. I would love to see a coloured version of it!
Mewtwo's pose is less exciting in contrast, but the shading and detail stood out to me more. I especially like his face and chest plate, though I felt the shoulder part of the chest plate shoulder looks too high, at least on the side whsoe arm we can't see.
Overall two very cool pieces, and I look forward to seeing more!