I thought I'd incrementally save this morning as I painted to show my process. This was done from a still life model. I start with a very simple sketch to get my proportions. Then I try to block in the main colors I see (I don't do a greyscale first... just right into the final colors and values together). Then I just keep refining to get closer to what I'm actually seeing. This was about an hour's worth of painting this morning.
I highly encourage you to try exercises like this. So fun and helpful for studying light and color.