Here's a value study from Stan Prokopenko. You can see that it's just a sketch, it's small, and it didn't take him long to do. More importantly, you can see how he's simplified and composed the image. He's simplified the image by turning everything into values. Now, rather than worrying about drawing each individual thing in the image he can quickly block it in. It's less obvious that he's working with the values to make each rock or tree separate from the ones in front or behind. The scene he's drawing from wouldn't have been like this in real life. The values would have been all jumbled up. He has prioritized them.
http://www.stanprokopenko.com/blog/images/sunsetpinetreeforest/value-comp.jpg |
Start by making up a 50/50 mixture of burnt Sienna and Ultramarine.
The reason for using these two colors is that they are compliments. That means that they are directly opposite of each other on the color wheel. When you mix two compliments you get a grey. While it appears that the colors on the color wheel should correspond to some color that you can buy, that's not actually so. These are the only true compliments that I am aware of that you can buy in a tube.
Below is a chart created by watercolor artist Lance Weisser. If you count on the top row, six from the left, see how the right mixture of these two colors makes a grey? That's the grey that you're going to mix and use for this painting. The whole thing will be done using different values of that grey.
https://weisserwatercolours.files.wordpress.com/2015/08/49-burnt-sienna-ultramarine.jpg |
Here's a little video demonstration:
Once you have your grey mixed up move on to making a string. Painters can work from a variety of strings; color strings, value strings, opacity strings and so on. Lance Weisser's example above is really a variety of color strings. From top left to right he has a color string that transitions from pure burnt Sienna to pure ultramarine. Descending from each color he has short three value strings that show the change in value as he adds more and more water to each color. Those value strings are what you're going to make. Instead of three, like Lance has, you'll make five. These five need to include your grey at it's darkest, the white of the paper, and three shades in between.
Here's a demo video from Peter Wolley. Note that he's not making a value string. You still need to do that even if he's not.
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