I have just a simple and maybe a little bit stupid question

Every Picture of 3d Model done with Hexagon has so a smooth surface.
Just everything so smooth. Is this caused by Hexagon or is it just a question of the the person doing the model? So is it possible to create more detailed and not so smooth modell? I think this should be doable but just wanted to ask... Because im going to buy a 3D Modelling Programm which doesn't cost about 1000 $ or more. And i think Hexagon would be really cool. If such models would be doable could somebody show me a picture or something like that? Thank you to every person who answers this dumb question from me
Greets Biber