This is the same with line work as well. Keep it fresh by practicing still life set ups at home if you can't get out.
There are two ways I have been doing this at home. I have been using Veronica Lawlor's book "One drawing a Day" which has drawing and painting exercise prompts. I also look to Tom Hoffman's Watercolor Class blogs to get exercises to do.
The following paintings were about practicing soft and hard edges by copying a picture and trying to create the same affect. In these examples, I was just practicing on very cheap paper. The paper as well as the timing, when you put color down with a wet on wet technique affects the outcome. This would look totally different if I had done it on different paper, if I had wetted both sides of the paper instead on one side, and when I lay the color down. It is good to practice these and jot down your steps to remember how you created the affect.
|Practicing edges Soft and Hard Edges. Wet on Wet.|
|Soft and hard edges.|