Taking good digital photos of 28mm and 15mm miniatures is difficult at best.
www.twfigurines.de is a German site with superb miniature photography. Fortunately the author also includes a small tutorial that describes how he gets these lovely clear photos.
The only thing I’d add is consider investing in a couple of blue ‘daylight’ bulbs for your lamps, because then you won’t have to mess with the white balance settings on your digital camera.