So I usually use this site: http://www.jinchess.com/chessboard/composer/ http://www.jinchess.com/chessboard/composer/ about once a week for creating diagrams.

So I usually use this site: http://www.jinchess.com/chessboard/composer/ http://www.jinchess.com/chessboard/composer/ about once a week for creating diagrams. Have a look at them for some feature ideas. Looking at your site the main problem I see is you don't indicate which player is to move anywhere. I don't use all the features on the other site but I think my main advice would be to have a very generic colours and piece-font as your default and give people options to change them.