She's an extremely complicated deity, I think. From what I've read, she may encompass any of the following:
-The sun, by way of her necklace Brisingamen
Any of these things could be associated with Freyja. For this particular image, she's doing some kind of magic thing, and instead of cats I gave her two lynxes, which are not strictly mythologically accurate, but whatever. The runes at the bottom just say "Freyja"
I absolutely love this image! There really isn't a lot (any?) work out there with Freyja being serious and doing the magickal stuff that She is so skilled in. I've got a request about using this image, and am sending you a DeviantArt note on it. Please let me know if you see the note and what you think.