Based on what HDR is meant to be, your image is fantastic. HDR can obviously be implemented to create a wide range of effects, but it's purpose is mainly to provide a high dynamic range photograph ... like the photographs of Ansel Adams. So, there absolutely IS a "correct" HDR image; although, as mentioned above, there is so much subjectivity involved in the art of photography, any technicality can be acceptably breached in order to produce whatever image you wish to create ... so, in that regard, there are no "rules" per se. Technically speaking, though, HDR is meant to render tonally correct, perfectly exposed images ... what we do with it beyond that is subject to perception and desire. Technically speaking, your HDR image is very well done ... at least to my eye.