Nice work dude. Where are the 24x, 22x and 16x versions?
Once you scale your hi-res icons down to smaller resolutions (either in vector or through raster resizing interpolations) you need to make sure that they continue to function as icons and not become blurry blobs: icons need to have a distinct shape and a good visual metaphor to quickly convey the message or functionality they represent. A good thing to do when scaling to smaller sizes is to use a raster editor and brush up the outline and otherwise most important visual elements. Think of the 1 pixel outline that a text document mime-type icon would have or something similar.
I did some work a while back on fixing a whole lot of icons that had been scaled down and exported without optimization for their new sizes. See [link]