Miniatures are designed to have a specific purpose.. be it look menacing, silly, or just plain sexy, one of the main tools in a sculptor's palette is the silhouette.  The silhouette of the miniature should give you an idea of the scale, passion, and energy that a sculpt possesses.  The silhouette in essence forms the lines that a miniature is painted within, and it must be interesting from every angle.
"Doctor Ood" by Curtis Shoemake
http://www.puttyandpaint.com/projects/7692
Doctor Ood does something interesting with the presentation.  It focuses the viewer on one set of angles.  All from the front, with a flat (very nice) painting as a backdrop.  One ace thing about the main picture here is that the figure itself has been posed in the silhouette of a mountain on the backdrop. This background triangle not only helps to focus the viewers' attention on the head of the fig, but at the same time draws attention to the alien shape of the head, with the tentacles filling out the triangle of the mountain.  The call box itself is askew, and looks alien to the backdrop, jutting out of the mountain range, while the Ood is the same color scheme as the land itself, almost including the landscape itself into the silhouette of the mini.  Top job of setting the miniature in the world.

                                    "Out in the Dark" by  Thorsten Wachtmeister, "Scar"
                                        http://www.puttyandpaint.com/projects/7691
Thorsten has made some very nice choices as well in this diorama.  His backdrop is sculpted and painted in the same palette of colors as the figures.  However, each figure has its' own specific setting due to the color choices.  On the monk figure the lantern shares its' yellow tones with the robe, floor and urns.  Tying them in visually to the figure, and isolating the figure within the piece.  The mages' red is echoed in the ivy to her right, placing her to the opposite in the setting.  These abstract "extensions" of the silhouette allow the two figures to be isolated personalities within the same picture.  
Note as a bonus that each angle places each figure blocking a line or edge and again focusing the viewer on the minis themselves.  (See how in the third picture the mage's silhouette interrupts the metal banding of the left door, while in the second picture it is the monk whose silhouette interrupts it.)
http://www.puttyandpaint.com/projects/7705
 And last we have Vorag here.  Francesco has done an immense job of defining the character with fantastic painting, but he has added a secondary element that I'd like to focus on.  It's that tree in the background of the first picture.  Visually, that tree extends the silhouette of the figure, making the action of the pose shift forward, despite the huge freaking axe that should weigh the action in a backwards motion.  In the second picture, the tree is almost non-existent, due to the angle.  It makes one of Francesco's great choices on this model rather apparent. By placing all of the brighter colors on the human figure, and laying a darker color on the axe and tree, he has made every angle have forward motion.  Rather impressive feat for a tiny tree eh?  Even the smallest shape can truly enhance a beautiful miniature.