I would submit that the settings actually have most of the "style" in general and think the 3.5 Eberron art is some of the best, most evocative art D&D has ever produced -- even if I agree that by and large the 2nd Edition era has more good art. Especially those dragon covers. Man.The art of a game does help you get a feel for it, and captures the imagination. AD&D (both editions) had better art overall than 3.x (most of which was kind of meh). 4e mostly focused on characters, but was a clear improvement over 3.x. 5e is kind of a mixed bag; while most of it is fine, there's not a lot that really pops.
Example from 4e's Divine Power:
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