Who says that leaves are green

[ec514]

Who says that leaves are green
Or sky is blue?<============== this line seems kinds of short. i feel like it doesn't match the "or night is immanently dark" line. maybe add an adverb before blue?
Who says that days are always light
Or night is immanently dark?
 
Who says what anything is really like?<===== i would say defines instead of says. it would put more emphasis on this line which would be good because this line begins the moral of the poem

Who says I have to be like you?
Who says you have to be like me?
For your green may be my blue
My light may not be light for you<=== my light may be dark for you?
 
… and my colors change as seasons go. <==== a bit of an abrupt ending. maybe you can expand on it somehow? 

anyways, this is a really beautiful poem and i loving its meaning and message