Add a few drops of water to each color that you plan to use, this will help them begin to soften up.
Mix yellow ocher and cadmium and paint each rib section of the pumpkin separately. Try to leave a little sliver of white paper between each section so the colors do not start to bleed together.
If the sections do start to bleed together, don’t worry. Simply let your paint dry completely before making on to the next color.
Leave a roundish spot of white toward the top of the center rib for a highlight.
Next, mix cadmium red light with yellow ocher. Add the color to each section separately, concentrating on the outside part of each rib and the bottom of the pumpkin.
Rinse your brush and wipe the excess water on a paper towel.
Then go back into the color that you just added and in small areas where the colors meet, lift the paint off just a little but and blend the colors together at the same time.
Repeat the lifting the blending until you are happy with the effect.
Mix together burnt Sienna brown with cadmium red and paint into each section. Add this color mostly toward the bottom and up the edges just a little bit.
This color is beginning to sculpt out the shadows. Rinse the brush and lift and blend the edges of the color just a bit.
Mix burnt umber brown with black and add just around the bottom part of the pumpkin and on the outside edge of each rib.
If you’d like you can lift and blend with your brush. Alternately, lifting and blending might not be necessary if there is enough water and paint on the paper. It may blend together on its own as it dries.