Well, you made use of your on-camera flash as fill flash.
That was a good decision.
You will soon find out, however, that the on-camera flashes are weak, and if you went into pro portrait photography, light would soon become the absolute key element to it (that is what I feel is the case, I am not on my way there myself, but I feel that I still have to learn HEAPS about light myself, too!!!!)
You ought to have waited for that other person to disappear before you pushed the shutter release ... he is quite a bit distracting, particularly since he carries this bright-coloured something.
The location is nice, so was the time of day ... now I don't know if you took this handheld in low light with a weak flash, or if it is from the compression, but it is quite soft. Could it be camera shake?
Despite the flash used, any detail in the man's black clothing has got totally lost ... don't know if the lasso tool and some selective highlighting can still do much, but it could be worth a try. Needs to be done with care, though, as not to give them a halo.