Yay! I finally have it! Thank you, Aggelakis!
Okay, I was asked to post these once I got them done, so here they are.
The first one is the whole-group photo, taken at the concrete bench northeast of AP's Wentworth's. (I decided against posing them on building steps, because I wanted something that would give each row height and visibility, but still have the back row relatively close to the camera, and steps have too much depth.) Not as much detail as I'd hoped for (plus, somehow, Sidekick Girl doesn't show up on the far-right front here), so I took photos of each half of the group.
Top row: Big Orange Guy (Battle-Axe/Invulnerability brute), Trapper Jack (Traps/Dual-Pistols defender), Super Weathergirl (Storm/Electricity defender), Six of One (Force-Fields/Electricity defender; a stranded Borg), Auntie Gravity (Gravity/Kinetics controller), Auntie Matter (Radiation/Energy blaster)
Middle row: WaveRider (Water/Storm corruptor), Jessie Valentine (Dual-Pistols/Devices blaster), Jade Katana (Ninja-Blade/Ninjitsu stalker), Frosty the Ice Man (Ice/Ice blaster), Super Firebug (Fire/Fire blaster; my namesake, and my first toon)
Bottom row: Max Security (Assault-Rifle/Traps corruptor), Hypno-Sis (Mind/Radiation controller), Fryerstorm (Fire/Fiery dominator), Doc Pruitt (Sonic/Empathy defender), Red Rockette (Martial-Arts/Regeneration scrapper, and my first 50)
Top row: Auntie Gravity again, Auntie Matter again, Auntie Freeze (Ice/Icy dominator), Gunny Sargent (Mercenaries/Poisons mastermind), Lt. Canada (War-Mace/Shield scrapper), The Mighty Flynn (Battle-Axe/Shield brute)
Middle row: Super Firebug again, Lady Goldblade (Dual-Blades/Willpower scrapper), FlashFire (Fire/Fire blaster; a concept toon, blending The Flash and The Human Torch), The Pink Panzer (Invulnerability/Super-Strength tank), Longbow Reactor (Radiation/Radiation corruptor)
Bottom row: Citizen Commando (Assault-Rifle/Devices blaster), No No Bad Kitty (Claws/Super-Reflexes scrapper), Spider Wasp (Claws/Regeneration stalker), Sister Spectre (Illusion/Kinetic controller), Sidekick Girl (Plants/Thorny dominator)
Less than an hour's work, and I'm really pleased with how well it turned out. Immeasurable thanks to Codewalker for making it possible.