Christiaanj ...
757 - long and stretchy
767 - looks like 757 who's eaten too many big mac's
777 - beefy boeing with 6 wheels per side on the main gear
a330 - looks like a 777 but not as many wheels
737 - small - pointy nose
a319 - looks smaller than the 737 - snouty nose
a320- a big a319
a321 - a stretched 320..
done