I am new to the deviant scene and have been asked by a number of people, "Do you sculpt the pieces in your gallery? And if not, where do you get them?"
The simple answer, is no I do not sculpt them.
The larger scale pieces (1/8 (~225mm) - 1/4 (~450mm) scale) are sold as "kits" generally with 10-50 resin pieces. They must be assembled, and many times some simple sculpting is necessary to blend the pieces together. There are any number of small companies (many times run by the sculptor or a sculptor/caster pair). If you search for "garage kit" or "resin kit" outside of deviant, you will find many links to their online stores. If you find them interesting, please take one piece of warning before purchasing ... there are any number of companies that sell illegal copies of these kits ... they will purchase a popular kit and make molds from it and then sell the illegal copies. These are referred to as recasts and cause real harm to the original artists.
The smaller scale pieces (generally 28mm - 32mm) are gaming miniatures and are used in tabletop wargaming (e.g. Warhammer, Warhammer 40k) and fantasy roleplaying games (e.g. Dungeons & Dragons). These are cast in white metal and will sometimes come in multiple pieces to allow for the complex sculpts to be more easily cast. Again, there are many "boutique" (small, individually run) companies that produce these, but there are a few that have massive catalogs (e.g. Reaper miniatures, Games Workshop).
In all cases, the work you see on my site, was painted by me. I use acrylic paints thinned anywhere from a milky consistency all the way to a Cool-Aid like consistency and paint these pieces almost as if they were a three-dimensional piece of watercolor paper. I prime the miniatures white (which acts the way the paper does in watercolor) and slowly build up color with a series of glazes/washes. The brushes used are very similar to watercolor brushes ... in fact, they are miniature versions of watercolor brushes ... Windsor & Newton make a special line of their Series 7 watercolor brushes specifically for miniatures.
Many times, I will also add a small diorama base or include multiple figures into a scene for a full-blown diorama. This allows me to complete my version of the "story" around the character. These bases use any number of materials ... from pieces of other miniatures, small statuary, small pieces of greenery (even spices for ground cover), etc to flesh out the scene at this rather tiny scale.
I hope this helps in your understanding of what I (and others like me) do to create these tiny pieces of art.
Thanks for all your kind words ... also, I do take commissions and I do sell my work.