Ben,
I believe I received your Marketing email last night.
The mail itself was actually quite good but I think you let yourself down slightly on the example images:
Are you aware that Apple applies rounded corners to the image. This would make the first one very hard to read. (something to bear in mind).
In case you don't know, Apple also apply the Gloss and Bevel for you. So your image can just be a flat file.
Note: Developers can turn this OFF and use their own Gloss like you have applied if preferred.
In my opinion the last one just doesn't "jump-off-the-screen". The whole thing seems a little dark. Just browse the App Store. It's full of bright colourful eye catching Icons.
Hope some of this information helps.
