I don't read IDW, but I remember people talking about how Sonic bought a sundress that Blaze seemed interested in (which happened to be blue) in an issue where they spend time together. Then they released this official art that references that issue. Blaze also wears a bracelet made of seashells, which was revealed to have been made by Cream.
Needless to say, this art is pretty much Sonaze material even if Sonic isn't there. The wind, the sundress, and the sunflowers surrounding her are all very suggestive symbols.
Blaze is wearing two gifts from the two most important people in her life.













