Group silhouette for 4 very specific characters

4 book characters (description will be provided, and will be detailed and specific) needed for book covers, thumbnail-sized logos, general promotion of series of books. Silhouette best so I'm not committed to features, but I'm open to alternatives, you are the expert. 300 dpi. I will shortlist if necessary and pay a smaller fee for drafts if I can't decide on the strength of the portfolio. Feel free to quote a draft fee.