Hi! If I understand your question correctly and this is about the facetted look once re-meshed, that's expected behaviour with low-poly meshes. The resulting, dense mesh is the same shape as the low-poly just with a higher density, which results in a much more defined shading. To get a smooth surface you will have to apply…
to be honest if i look at your models and these, i am not seeing a big difference in quality. i see difference in style. some of those examples have more details put into the models, but they go a little more towards realism. some of them have more contrast in the lighting. some of them have a little higher production…