It is great when people use screenshots. You can communicate better by using screenshots with balloons and other visual elements (arrows, shapes, and highlights) instead of only text. Read the benefits of using screenshots.
We recommend you define a standard style for your visual elements by changing the default colors and shapes according to your branding.
See some examples of different visual elements under same branding:
Figure: Indicate someone to enter the mobile field. Do you use a red arrow?
Figure: Or do you like the red box?
Figure: Or do you like the yellow highlight?