I don't think you can because SketchUp can't export as an image. You could always take a picture of the screen (PRNT SCRN button, paste in image editior like MSPAINT), crop out everything except the model, save, import into Scratch if you wanted to.
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I use google scetchup, and it works.
i make my model, get a nice view, go to export, 2d graphic, save as...
i turn little bit, export, i turn little bit, export,......................................................
<when green flag clicked>
<forever>
<say[ scratch on! ]
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