Indeed, the Sehkmet, which is the closest thing we have to canon, is very rounded, smooth, and very... yellow. The ship models above look more like something the EA would build. Even if the texture was changed to make them look more in the style of the Sehkmet, they are too rigid, if you ask me. Compare them to the cruiser which looks almost organic, (which is why Vorlon ships were the best choice to use as fighter models) and it doesn't really add up. Most of the ships that we see most often in the series have some sort of recurring theme. EA ships are long and skinny, Narn ships are wide and flat, Minbari ships look like fish, Centauri ships all have arches, etc. I don't see any common theme between those models and the Sehkmet.