Two things jump out at the eyes: for your southern continent, the reliefs are equidistant from the two shores, while one might expect more a distribution such as South America, on one edge or the other of the continent. In the middle part of the map, there is this big land mass which I might see coming up to the upper land, in this case the relief should be turned by 90°. But all this critics are without meaning if you have in mind another plate tectonic. I think It depends greatly from the viewer point.