Please note that all art is unique to the character. The examples are of one character just to show the style/quality of art. I Repeat, all art is unique. There are no cookie cutter images (except for the crystal).
Crystallized Heart:
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The crystallized heart is made from the tears of a fallen angel. Each angel has a reason why they were fallen to earth. Once they cry and confess, their memories and hearts are crystallized in a heart-shaped relic.
Broken Heart With Spirit:
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After it's found a guardian, called the Spirit Keeper, the crystal will shatter and a spirit-like mist will appear. This is the soul essence of the fallen angel.
Infant:
With care, the spirit will form into the form of a human baby. This baby will be the new body for the fallen's spirit. They're as innocent as the day their soul was born in this stage, much like a human baby. They are weak and depend very much on their spirit keeper.
Toddler:
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As a toddler, shards of their memory start to come into place. Little mini flashbacks (usually in the form of nightmares) plague the child's mind occasionally. Fortunately, hugs and kisses from their spirit keeper tend to calm the child down.
Their much more independent, though still rely heavily on their spirit keeper for just about everything. They can walk and somewhat talk at this point, though they still have no magic to speak of.
Kid:
As a kid, they're much more independent. Their memories are coming back, a bit more frequently than as a toddler, and they're harder to forget. Not that all their memories are going to be bad, but their flashbacks are going to be more realistic, as if they're there all over again.
Teenager:
As a teenager, their final memories, the memories of their betrayal (or what caused them to be cast down to earth) and their decent to earth, return to them. With the memories comes a letter from heaven giving them a quest to redeem themselves. Once the quest is completed, the Bleeding Heart becomes an adult and can choose to ascend to the heavens and become an Angel-guide to a future generation of Bleeding Hearts, or remain on earth and have their own family.
Adult - On Earth
-To Be Written-
Adult - Guardian
-To Be Written-