Vesta from NASA's 3D model library. Created by Doug Ellison / NASA-JPL.
Download the original file here: http://nasa3d.arc.nasa.gov/detail/vesta
I've included a display stand suitable for mounting the completed model.
Glue the two halves together, then fill any gaps with plaster, clay or any other hard-drying household filler. Paint with acrylics and inks.