From my experience there is a vast difference in the amount of effort that is required to smooth out wax sculptures versus sculptures sculpted with any of the polymer clays. The underlying principles and concepts are the same but wax, when cooled, is a much harder medium and thus requires quite a bit more work to achieve the desired result. Keep in mind that this is under the assumption that you smooth out your polymer clay sculptures prior to baking, which I have always done in the past. Some sculptors will bake their polymer clay sculptures and use wet sanding techniques for the final smoothing stages (this process will exponentially increases the amount of work needed to smooth out the sculpture).
Finding your artistic roots. Always be true to yourself as an artist.
Out of all the lessons I will be putting together I believe this is the most important lesson of all. First of all your artwork should be an expression of yourself, your interest and your beliefs. Art should be more than just something that is pretty to look at, otherwise what is the point. I think a lot of us over time try to create art that we think will sell or please others. I myself have been guilty of this and in the long run I always felt a disconnect from my art that was solely created for commercial or monetary gains. Now, there is nothing wrong with profiting from your art but if your whole motivation for the creation of your art is the all mighty dollar then I think you have missed the point. The goal here is to get rich creating art you love, not art you hate or could care less about ;-).