I think that the pose for the lower legs will work as long as you give him a really hefty tail that his weight is clearly resting on.
To do this you are going to have to shift his feet way forward on the base, or extend the back of it, so that the base can accommodate the tail. If the tail doesn\'t make plenty of contact with the ground I can\'t see any amount of work on your part stopping it from looking wrong to be honest.
I think his left leg also needs more contact with the ground. It\'s a bit too floaty right now.
I like the crazy knee pad though, puts me in mind of a Jim Henson creation from something like Labyrinth.