The rain video's awesome (if a bit quiet)! Love that lightning will be more than just a pretty picture.
The flower-cup porcupine looks almost spot-on to the concept art. Except that it looks like it wants to eat my soul.
I think it's the eyes that make it look a bit psychotic. The concept art makes me think the eyes are recessed into the skull a bit like most mammals, but the model has them bulging out excessively. Not sure if the sly look of the right-most concept critter would even be possible with those bulging eyes. It certainly doesn't help that they've got a glassy cross-eyed gaze. The nose also looks odd, too large and blunt for most rodents, too small and sharp for normal porcupines.
Based on images of real porcupines, they probably need a lot more fluff around their faces. That would hide the bulging eyes and round out the nose, so they'd look just fine with no other changes. Alternatively, bringing in the eyes a little and making the snout pointier and shorter would make it match the concept art better.