I think an Elf with Halsin's bodytype only really becomes an issue if it's commonplace, the median strength for all elves should be 8, nothing about that means there can't be strength 18 elves, it's just exceptional.
More of an issue to me (and a minor one at that) and I think more in line with the thread, is how square his face looks, there doesn't seem to be much difference between human, half-elf, and elf facial structure, but that has to be a result of them using real people as models.