Isis is the ancient Egyptian goddess of motherhood, fertility, birth, rebirth, nature and magic. She is also protector of the dead and goddess of the children.
Isis has several characteristic symbols, namely the lotus staff and the ankh, symbol of life. Sometimes her headdress is shaped like a throne, sometimes she wears the sun disk with horns as shown here.
Isis' name means "She of the Throne", you can also see the throne in her hieroglyph name in the background. You can read more on her in Wikipedia.
Isis is mainly seen as mother and protector of the weak, but her powerful magical abilities also play an important role in the mythology. I wanted to depict her as mysterious and wise, powerful but benevolent.