Thanks. I'm not designer. My graphics skills is very poor

And I like simplicity

Good work. We should build up on this idea. Simple is good.
http://www.istockphoto.com/search/lightbox/14682638#47374caWe need a unique and noticeable color.
PURPLE could be good, but a fresh
LIMEGREEN could be nice as well.
In my opinion a more unique logo with the concept of "smart" would be nice to have. And we need more color. You can´t see our logo between the others. The reason to have a logo is to build up a certain image and that the ppl. recognize you. With a grey one it´s not really possible.
In our marketing activities we should focus on the "smart" theme. This makes smartcoin special and in this way smartcoin is being different to other altcoins. We need long lasting attention, from miners, investors and business / shops. A large part of the value is the brand awareness of a coin.Maybe something like the brown one with an other color. (It´s just a mood!!!)
If we have such a logo, we can use it as the key-visual in all our marketing activities. (Just a mood!!!)
