The 24-year-old Dover artist and alumnus of the Joe Kubert School of Cartoon and Graphic Art is the penciller of "Marvel Age Spider-Man," a new line of comic books being marketed for readers ages 6-12. With the second Spider-Man movie premiering today, and merchandising for the movie on everything from baby bottles to cans of Dr Pepper, Davis'work will contribute to Marvel Comics' efforts to sell itself to a broad market that exists between the big screen and the doors of the local comic shop.