Scale diagram comparing a human and the largest specimens of two stegosaurus species.
Size based on:
S. ungulatus (YPM 1853) - Holtz, Thomas R. Jr. (2012) Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages, Winter 2011 Appendix.
S. stenops (USNM 4934) - Galton, Peter. (2010). Species of plated dinosaur Stegosaurus (Morrison Formation, Late Jurassic) of western USA: New type species designation needed. Swiss Journal of Geosciences. 103. 187-198. 10.1007/s00015-010-0022-4. 
credits to:
Scott A. Hartman - (www.skeletaldrawing.com/)

GetAwayTrike - (www.deviantart.com/getawaytrike)
Own work
KoprX