Sometimes it's a bit easier to see the dimension on the window when taking a side view shot.
Maybe this helps a bit.
This card actually had a mind of it's own, starting out completely different than how it ended up. I had a cute little image colored up to use on the side of my frame thinking I would add one of these word circles and be done. It ended up being all about these word circles that I die cut from the "Atlantic" paper pad from Studio Calico.
One of my all time favorite, die's is the Simon Says Stamp, "Happy Birthday" die in Kristina Werner's handwriting. It's a must have, for sure!!
Here's another shot with a bit more light to it.