I want to put angel wings on this picture. I don't want to purchase photoshop. Is there any free site I can use?

My best friend passed away and I wanted to put angel wings on her picture. I was wondering if there was any free site I can use to do this? I know photoshop has this feature, but was wondering if there was any other way I can do it? Does anyone know of any free sites? The photo I am trying to edit is my avatar.