While I can't help you with that visual inspection you may want to list whether you own an IS250/350/F and whether you have RWD or AWD. It may also help to take a picture that doesn't skew the perspective.
Fronts are the shorter ones and the longer ones are for the rear. It also seems that someone color coded them too with those (blue & teal) stickers.
2007 Lexus IS 250 AWD
Black Sapphire Pearl / Black Leather / Premium Package / Navigation / HIDs F Sport - Intake, Shift ****, Springs, Shocks, Rear Chassis Member Brace, Rear Sway Bar
Tanabe Medallion Touring Exhaust, Putco Jet Yellow fog-lights, Solar Gard High Performance Tint 35%, Lexus IS AWD All Weather Floor Mats, Steering Damper, IS 350 Brake Calipers, Rotors, and Pads Next Mods
F Sport Front Sway Bar