Ok, your hard edges look pretty good, but Id remove the ones around the wing leading edge and tips unless you want it to look like a knife coming at you. Also, remove the ones on your rims, and add some to define the transition between the tire and rim. The rest looks pretty close. Remember, you only want hard edges where there will be a distinct crease, or edge. It also looks like you've got them running across the decking in the cockpit area. Depending on what you're looking to have going on there, you may want to remove those as well.
Now, for rendering, Download
THIS. I dont think there's any special install location. Once in Wings, you'll have to setup lighting. I usually just use the infinite light, but you can play with the different ones to find which ones you like. Then under the file tab, select render>kerkythea (click the box to the right so you can adjust the image size, save location, and other options) That should get you to a basic render.