If you generate "Project Report" for your BPM project, you can get the image of your process(es). Follow this:
1. Right click your BPM Project and select "Project Report" option.
2. In "Report Options" window accept defaults and on the next window "Report Output Type", choose "HTML" and click OK.
3. Choose your destination folder and there will be a JPEG image file named "diagram" under this directory: "<BPM_PROJECT_NAME>\content\processes\<PROCESS_NAME>_default\