The size values for the brush don't have an appropriate scale

[dmarcos]

The schema states a min: 0.0 and max: 1.0. The values in the interval all set very big brushes. We have to either introduce a correction factor somewhere in the brush logic or change the schema to reflect a better scale.

[fernandojsg]

I believe we should change the schema to use meters. So we could have a maximum width of ~20/30cms so it should be max: 0.2/0.3.