Come on man, you've only got one shape done. Can hardly call it a WIP.
Yet I shall give my opinion, get ready;
First of all, get rid of the one color stroke or turn it into something detailed, this shit does in no way fit the rest.
Second of all, fix the shading on the middle part, being out of the light doesn't mean it's all one color, there should be a very slight, smooth gradient just to make it look like it's actually all made of metal, which I hope is what you're trying to do.
And lastly, you might want to make the shading on the second ring a bit smoother as well, the contrast looks horrible in the lower part where the color changes from black to grey.
Oh and, just a word of advice, try making the lighting come from the top left or right, it will make the logo look less plain/amateur.
And he just used the ellipse tool, duh.