JLA/AVENGERS (2002)
art by George Perez
from ha.com

JLA/AVENGERS (2002)
art by George Perez, colors by Tom Smith

JLA/AVENGERS (2002), From Michael Lovitz, via Perez Gallery (ACTOR Auction from MEGACON 2002.

JLA/AVENGERS (2001)
art by George Perez, colors by Tom Smith
from tomscolor

JLA/AVENGERS (Apr 2001)
art by Perez, printed in COMICS INTERNATIONAL #132, colors Smith
from tomscolor

CAPTAIN AMERICA vs BATMAN (May 2006)
art by Perez at MOTOR CITY COMIC CON 2006
from larry clay

JLA/AVENGERS (Oct 2004), art by Perez from JLA/AVENGERS:  COLLECTOR'S EDITION from Daniel Partouche

JLA Meets the AVENGERS (2002), art by George Perez for ACTOR Auction at MEGACON 2003 (sold for $1,900)

BATMAN vs CAPTAIN AMERICA (2004), art by George Pérez, from pdidinyc

JLA and AVENGERS (2000), Art by George Pérez, originally published in WIZARD: THE COMICS MAGAZINE #105 (Jun 2000)

JLA and AVENGERS (1983), published in GUERNSEY'S: CARTOON AND COMIC BOOK ART

JLA/AVENGERS PROMO (2001), art by George Pérez,

JLA/AVENGERS PROMO (2001), art by George Pérez, colored by Tom Smith (original)

JLA/AVENGERS PROMO (2001), art by George Pérez, colored by Tom Smith (background color changed from the original)

JLA / AVENGERS (2002), art by George Pérez, colored by Tom Smith

JLA / AVENGERS (Aug 2001), art by George Pérez

JLA / AVENGERS (Aug 2001), art by George Pérez. From Gary Land

JLA / AVENGERS WOMEN (Aug 2001), art by George Perez, colored by Tom Smith, published in JLA/AVENGERS: THE COLLECTOR'S EDITION OVERSIZED, SLIPCASED HARDCOVER.

JLA / AVENGERS (2002), art by George Pérez, colors by Tom Smith

JLA/AVENGERS (2003), published in PITTSBURGH CON 2003, From Tom Smith

PITTSBURGH CON 2003 (Apr 2003)

WIZARD JLA/AVENGERS (Feb 2002) art by by Perez, colors by Tom Smith

JLA and AVENGERS (2002), Commissioned by Kirk. From The Artist's Choice

JLA/ AVENGERS (2003), published in PITTSBURGH CON 2003, From Tom Smith

JLA and AVENGERS (2002), Commissioned by Kirk, colored by Marcus Mebes

JLA / AVENGERS (2002), art by George Pérez, colored by Shell

JLA / AVENGERS #1 COLOR GUIDE art by George Pérez, colored by Tom Smith

JLA/AVENGERS (2003), published in JLA/AVENGERS #3

page 1

image from The Powerful Art of George Perez

page 4

image from The Powerful Art of George Perez

page 10

image from Rob Liefeld, via ebay

page 14

image from Rob Liefeld, via ebay

page 16

image from Rob Liefeld, via ebay, thanks to Ilke Hincer