The layers of map come from two major sources: search or drawing.
Currently, the supported shape of drawing includes point, polyline and polygon. Drawing of more shapes are under development and will be delivered soon.
Different type of shape has different styles. You may have to switch the Point/Polyline/Polygon tab in the right style panel before you change the style of selected shape. The style panel could "remember" the style of last selected shape, so when you start a new drawing, it could reuse the previous style.
When you use image as the fill pattern of a polygon, like other images in the post, the uploaded image could be stored in the supported infrastructure like cloud based OSS via different Ghost storage adapters.