Hi @mikhail,
you can include files like images, toolbars etc. inside the folder structure of the rhi installer file. There is some information here.
I would recommend the RhinoScript PlugIn Compiler to create the rhp file from your python script. If you compile for Rhino 6 you’ll need to reference the RhinoCommon.dll of Rhino 6 in the PlugIn SDK settings.
To reference images, you’ll need to find out how to find them using the plugin installation path. I guess you’ll need relative paths so the compiled script can still find them.
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c.