Some old Beast Wars sketches I've dug up and scanned.
Drawn in 1998:
Snarl
Powerpinch
Transmetal Terrorsaur
Scavenger
Transmetal Airazor
A rather skinny Optimal Optimus
Lio Convoy vs Galvatron
Drawn in 1999:
Dinobot vs Hardhead
Big Convoy
Ravage
Silverbolt and Blackarachnia
Airazor
Drawn in 2003:
Transmetal 2 Blackarachnia
Convobat vs Meglligator
Drawn in 2004:
Unicron's Four Horsemen