Entry #13: You're on the right track... just need to make the oval a rounder circle and make the knight look classier. Like I mentioned in my brief, "...design should have a modern look with a touch of antiquity (classic)." The circle and the chess board in the background has a modern look and the knight in the middle should have a classic look. I love the colors.
Entry #13 and 41: Much better... the knight needs more work, it needs to look more like a genuine Staunton chess piece which is what I sell. Here's a link to a picture of classic Staunton chess pieces.