I know others have said the "wet look" looks good.
While the engine DOES LOOK shiny, in this pic it does not look clean. It looks splotchy like it has "spotted engine fever" or is that PRIOR to WIPING off? Your Throttle Body is covered in spots!!
I have found that DRY works best. The engine gets a lot of warm air and dust (or whatever is on the road surface) from underneath. It may "bake on" some chemicals if left on. I take a lot of dirt roads, so I have to clean my engine frequently. I have found that using simply WD-40 and then wiping it down does best. Takes more elbow grease but my engine really thanks me for it later! Did you clean your TB inside while you were there?
Congrats on the new car! Love that color combo.