Actually, I would just blend it in more. If the edges were a little softer and the image showed through it some it would look more like a camera lens flare. It has a strong post work look now.
I have tried these using Blender and Corel Paint X2. I think Lightwave 3D or 3D Studio would give you better results with this kind of post effect. They are very hard for me to get them to look right...