Left is much better, as it has more contrast. I really liked the potential in this piece so I edited it some to give you an example of things you can fix in your graphics. If you follow these guidelines you will notice when making graphics it'll take a lot less time and your work will look so much cleaner.
First, limit your colors. I noticed you were using probably over 10 for the piece and that is not needed. For smaller pieces, probably 3-6 is fine.
Second, contrast. Since this piece was white, there was various options you could use for the hue etc. Could go from blue to white, gray to white, etc. etc.
Third, AA. This is most important. I'm not sure how to explain it but it will help limit your jaggies. Best if you check the link I provide for you, it explains it well.
http://pixeljoint.com/forum/forum_posts.asp?TID=11299
Fourth, Light source. This probably should've been the first one lol...anyway always make sure you have a point in which you think the light is shining onto the object. Normal ones for graal are usually center.