There are a few things you can do to fill in color in Adobe Illustrator. The first is to use the eyedropper tool to select a color and then use the left and right arrow keys to move the color around. You can also use the up and down arrow keys to change the hue of the color. The next thing you can do is use the brush tool to create a brushstroke. You can use any type of brush, but it’s best to choose a brush that is easy to control and has a wide range of colors. The last thing you can do is add text using the text tool. You can create text using any type of font, but it’s best to choose a font that is easy to read and has many different types of fonts.