I like the late summer one the best.

'IT'S ALREADY JULY! OH NO! OH NO!'
'What happened to June? The summer holiday is trickling through our fingers like sand!'
'Time's going too fast! We have to nurse our freedom and have more fun! Time is running away! Help! Help'
'AAAHH! It's half an hour later than it was half an hour ago! RUN! RUN!'

Spring seems a bit too angry and fierce though. I'm not familiar with the concept of yin and yang, so I don't know where/how/when those benevolence and anger emotions come into play. Springs has always been, to me, a season of rebirth and new hope, but your spring looks...well, too angry and, if I dare say so, evil.

Winter is also quite imaginative. Maybe a snowflake would've suited it better, but that wouldn't make it as creative as it is now. I feel kinda sorry for winter. It hears everything, but can't see. Wouldn't want to take a walk in an old forest *cough*Mirkwood*cough* and be Winter.