In SketchUp, the Watermark feature can place a graphic in front of or behind your model. You can add a watermark for its traditional purpose: inserting a company name and logo into your model. However, watermarks have creative applications, too: inserting a background image to create a unique model setting or overlaying your model with a translucent or cutout image (such as binoculars). To add a watermark to your model, follow these steps:

In SketchUp, you can set a few preferences for how the software works overall and how files are saved.To access these preferences, select Window > Preferences (Windows) or SketchUp > Preferences (MacOS) from the menu bar. Most of these preferences are on the General pane, which you click in the sidebar on the left. As shown in the following figure, your options include Saving preferences at the top and Software Updates preferences at the bottom.

Styles are shared in .style files that can be opened by any copy of SketchUp 6 or later. You must create a .style file to share a style with others. To share a style:

In SketchUp, collections help you organize styles and easily access the ones you use most often. SketchUp includes several default collections, but you can create your own and save collections to a favorites list.The In Model styles collection is particularly helpful, because it contains all the styles currently included with your model file. To see your In Model styles, follow these steps:

In SketchUp, you can create and edit styles so that you can apply your preferred style settings with a single click.To create a new style, follow these steps:

A big part of your model's style is what you see in the background. SketchUp makes it easy to customize the background including the sky, horizon, and ground to best fit the style of your model. After all, what's the use in making a Mars Rover if it doesn't look like it's on Mars? You can customize the background colors of your model in the Styles panel by following these steps:

Styles in SketchUp are a great way to help you convey information about your model without saying a word. A Style is a collection of specific settings for edges, faces, and backgrounds. A Style with pencil-drawn edges and a fuzzy color scheme can suggest your model is still a work-in-progress, while a more formal model will use colors and settings that can help make your model more photo-realistic. Using the Styles PanelThe Styles panel contains a great selection of predefined styles you can use in your model. To choose a Style: 

In SketchUp, you see a tan and blue background that suggests the earth and sky. The default background might be great for buildings, but looks a little strange for a model of a rocking chair, as shown in the upper-left corner of the figure. No matter what you’re modeling, you may just want a plain background with sketchy edges to communicate that your model is a blueprint or prototype. Or you may want a polished and detailed background that simulates an interior or a street scene. Notice how the different backgrounds change the look of the model in the figure.

Using the Soften Edges feature, along with the Smooth edge property, changes the visibility of edges and can make your model look more realistic with less geometry. As an added bonus, it may also improve your computer’s performance.Understanding the edge propertiesIn SketchUp, the following properties, in various combinations, enable you to control edges’ appearance:Soft: When you soften an edge, the edge is hidden, and the faces that the edge bounds become a surface entity.

Drawing a model in 3D is different from drawing an image in 2D. This introduction to drawing basics and concepts explains a few ways you can create edges and faces, (the basic entities of any SketchUp model and also discover how the SketchUp inference engine can help.