Photograph the canvas for maximum hand-painted effect. Place the lights almost directly over the painting you are reproducing. This will make deeper shadows and stronger contrasts, emphasizing the texture of the paint.
Edit the digital photograph of your painting to show the details as much as possible. Use the contrast control on the photo editor to increase the contrast, making lights and darks stronger. This will bring out brushstrokes and textures. Use the "unsharp mask" command to increase the detail. Contrary to the sound of the word, "unsharp mask" makes your image crisper and sharper. This emulates the oil painting details in your painting.
Use hand touches to add to the hand-painted effect once it is printed. Use the same colors as the underlying print, but use impasto (thick paint) to make the digital canvas more convincing as a painting. Small daubs of paint placed in a few strategic area like a highlight or edge of an object makes the print three-dimensional and more resemble an actual painting.