The updated one is sure a change from your first picture! Great job on this.
Oh, and serveral things:
1- The lips: It's not necessary, but could you make them a bit thinner? What's the height of the blocks currently? You could just decrease it by 1, or if that looks weird, you can just copy / paste the whole thing, and overlap it a little bit, but it might be a tedious job to do.
2- I personally think it doesn't really need a lot more rounding - looks good how it is. It might just be the camera angle, but if you have not already, maybe put 1 ~ 2 blocks at the bottom? It'd look a lot better then.
3- I really think that Victreebel could use some more spots, if you look at your avatar sprite, it has much more dots. Also, try and experiment with the eye texture a bit, make the sides more slanted like \__/ something like that.
You've got yourself a great model there!