I think overall the design is really pleasing. At the very top, the space between the buttons isn't consistent, it seems to get smaller to the right. The lightsource of the background image and the cup made of coffee beans don't match either, it seems that the light source is more directly above looking down, rather than shining from behind the viewer.
One thing though. That cup looks a bit out of place... the beans that form the cup are so bright...maybe highlight some of the beans in front of the cup too ( because the light comes from the front-right ), or just darken a bit the bottom area of the "beans cup". Either than that, it's an amazing design...and I want one of those cups (is it a stock image? if yes, can you please share it)
I would have understand if you would have told me that you don't want to share the picture, but not lie. I found the stock by mistake and I was disappointed in a way... I really thought you actually created the cup. Anyway... take care