Watercolor Aceos

I paint aceos mostly in watercolors there is one in today bunch that is an oil painting. I find it hard to hold on to the small paintings when try to work in oils. Does anyone have any ideas on how to do it? These are all Aceos. Artist trading Cards and are 3.5 x 2.5 the watercolors are painted on 140 lb cold pressed watercolor paper and the oil was paint on canvas paper.

These small gems can be bought at my ebay store. Delilahs Art.

The Old Cow is painted in oils.