When entering sculpt mode for the first time, it's worth knowing the settings available to you and becoming acquainted with a few commonly changed defaults:
The Dyntopo, or dynamic topology, section has settings related to a relatively new feature for sculpting in Blender. Dynamic topology will increase or decrease the complexity of the model in whatever local area needs it in order to make the details we want to add. In other words, if we want a lot of detail on the top of the model where we'll be doing all our work, but not the bottom, which is mostly going to be ignored, we don't have to worry about making the whole model more or less complex. Dynamic topology will handle all that for us. But it needs to be turned on.
5.00 px
.The Detail Size value is how big the polygons will be made when sculpting. Notice that this setting is in px
or pixels. This is a setting based on the view, not any actual measurements. If the view is zoomed in closer to a model, there will more detail added. When you zoom out, the detail may be reduced, eliminating some smaller details.
We're now ready to start sculpting our disk to make it a sunny face.