ok, see what I can do more for you :).
The shoe now look a little like plastic. Don’t know how you did the shader, but the easiest is of course to use the glass shader, which I belive you did. Since you would like to have it more like a crystal shoe, you should then change the IOR to about 2. This link is good if you want to find a specific material: http://forums.cgsociety.org/archive/index.php/t-513458.html
Post your shader setting if you want more help on that.
It could be ok to take away the smooth, it is just a matter of taste in this case I belive. I think that the decoration on the shoe is nicer now, but it is up to you to select path :).
When rendering, you can always check the box “Progressive”, which means that the complete picture is rendering at once… making it slower but with the advantage that you can interrupt the render when it feels “finished”. There is no exact science in amount of samples, so depending of light, different objects and so on you can get perfect samples already on 500… but in some cases it will be more like 5 000 (dark, foggy scenes for instance).
To use HDRI, goto “world” icon. Select surface “Background”, color “Environment texture” and then select the HDR picture you want to use. There are lot’s of good ones to use here: http://www.hdrlabs.com/sibl/archive.html
…but inspite all I have said, it looks good. You have done a fine job with modelling.