Personally, I really enjoyed the mother ending more than the true one...all evil was put to end then. Since the game is actually EVIL, an innocent scene would be perfect to emphasize the irony XD
Anyways, the flowers are Anemone (which look like daisies...) which symbolize "Forsaken, sickness (negative), anticipation, unfading love" (Wikipedia)
I thought the flowers described the mother's love towards Aya perfectly, and I do think she loves her daughter dearly. But alas, everything has faded into the abyss of memories...
>>Probably going to draw a similar one for Dio (shonen)