Kinda' hot in these rhinos!

I've always liked the way rhinos looked, and my buddy Kory Hubbell's awesome sketches inspired me to take a crack at sketching one. You can find his work at www.koryhubbell.blogspot.com. We're thinking of doing an art book together. Anyway, I wanted to exaggerate my rhino but maintain a level of realism. I plan on revisiting this drawing and have no doubts that it'll lead to a finished design/illustration.