Looks good! My only suggestion would be to find a sanding sponge - they're easier on the hands than using sand-paper alone at removing fingerprints from sculpted areas.
The figures contained in the Custom Showcase are not for sale by Figure Realm, and the creators of the customs are no way affiliated with Figure Realm. The Custom Showcase is purely for entertainment purposes and only provides a means for the creators to show off their work and trade ideas. Figure Realm does not make or sell customs.