Yep, that's Luke Skywalker in the bottom left corner of the cover.
Inside the book, we learn his name is Layzar.
There's another character in this book I'm a bit suspicious of, but only a little. It's a robot, and its name is either UDD2, which would resemble R2-D2, or it's UDDZ. The font is sloppy, almost as much as the drawings.
This book was released in 2005 by Top That! Publishing Inc., and I'm pretty sure I could top that.
There's 101 characters in this book, but a lot of them aren't super heroes. Luke Skywalker is a good example. There's also Robin Hood, Buffalo Bill, a surfer, a skater, a Russian guy, a man in an airplane, a hunter, Sitting Bull, a pirate... And the characters that are super heroes fail to impress. If you're doubtful, just take a look at Super Silly-us and Super Nan.
Later on in 2008, Top That! Publishing Inc. rehashed this book and slapped it within a giant book called How to Draw. And yes, Layzar's still inside the book, though he no longer graces the cover.
The cover promises "Over 400 step-by-step pictures to draw!". There's just a few over 400.