This was the first image I did after learning how to add reflection to an image. If you look closely below the ball, on the floor, you will see the reflection. Reflection, number one, make things look more life like. It is also a great way to give the impression that something is glass If you really want something to look like glass, add reflection to it. Reflection really seems to give the effect of transparency a lot better than using alpha alone; in the Materials menu choose "z trans", cut down a little on the alpha and add an envmap for reflection. Of course the envmap will not do any good unless you have another object in the scene. Make sure it is very solid, exspecially if your model will be doing the reflecting has a crazy texture.