The Flamingo render plugin became obsolete with Rhino 7 as the default render in Rhino 7 is as good as Flamingo. The upgrade will remain available for a while.
When you want to render at the highest leven and spend much more time in making visualizations, please take a look at the V-Ray render plugin then.
Try the evaluation version. The evaluation version’s resolution is limited to 640×480 pixels. It also watermarks the final rendered image.
RhinoCentre’s client Cosco Heavy Transport, asked us to model several vessels of their fleet and set up the render settings in Flamingo. This way they are able to use the 3d models for designing transport projects and also render them for presentations. The level of detail of the 3D model is the basis for a more realistic image. Another decisive factor is the lighting setup.