Ahh, I was actually watching your champion's developement before you even commented on mine haha! I love your art btw
Two points if you're looking for advice? I think his posture makes him look a little "floppy" which might be contributiing to his whimsical look, and not so much the design himself. I know you're probably going for the tall lanky assassin but his neck/head is very upright while his body is slouching, which makes it look like he is naturally crooked.
The second thing is that I think in your rendering you might have made it too shiny? I felt like the wip before the first rendering was an excellent image and reminded me of something I would find in an old bestiary, But the rendered images use a lot of dodge/highlights which takes away from his dark/damp/mossy feel.
What do you think? Love the character tho!