If I'm being totally honest, you could have at least put the images here.
Also your logo is very familiar looking but can't think where from.
In my opinion you should have used golden ratio not circles for your curves, it would have suited the design better. The line weight is also too thin on the 'swoop' at the end because it vanishes at small sizes. Also if it was supposed to be '3D' the perspective is off quite a bit with the swoop.