oh btw... its not that hard in this image to tell who is who ... like what they say..... one can recognize them without their trademarks.....
in this one though... its easy
they still have their trademark cloth scheme..
alice with her sashes, marisa with her black white color scheme, reism rivers with their colors too (+lyrica with the elec piano and lunasa with the player=music)... momiji with tha color scheme (and for some ... her fandom boobs) nitori with her color scheme correct cloths and her bag and finally the two crow tengus aya and hatate with their uniform like clothes...
there are some without the clothes' schemes and hats.... which is i more way of knowing them... the longer you are a touhou fan the more youll know their usuall expression ... just look at the face and hair color and bam you know them.....