keys to looking bigger:
1) Stomache-If you wanna look muscular and strong, the key is a ripped stomache. Even small thin guys who may not have a bigg ass chest, but do have a nice stomache look bigger then what the really are. But if you llook at a muscular guy who has a gut then all he is is a huge fat guy ( no offence to powerlifters)
2)SHOULDERS- the shoulders are the key to looking big, even when a shirt is on. by having big shoulders you give the illusion of a thin waist line and bigger upper body. Plus when you have a shirt on and you have wider shoulders it is more noticable then who is 135 5"10 and has a shirt on, if you know what i mean.Also your delts are the only muscle you can see from any angel wether it be from behind, the side, or front.
3)Legs-with out big legs all you are is the Tazmanian Devil off of WB. your legs are a key essential to fullfilling symmetry. A guy maybe able to bench 500, but he aint nothing if his legs cant back it up. remember a tree can only get as bag as its trunk.
4)Traps-If you wann alook huge to anyone, then your trpas are the major roll here. if you wanna seriously look like you can lift alot, even though you may not be able to. Traps will have this affect. since when have you seen a bodybuilder who did a most muscular pose and not have humongous traps.
5)Triceps- these are the key to making your arms look huge. your triceps are what give you great width on your arms andare the muscle that makes your arms appear very huge when your arm is not flexed, just laying by your side.