your objects have sharp edges... which make it unrealistic. add some bevels to it instead.

A low res Atap house, very few documented images if such old house a few hundred years ago, the impression is based on limited reference.

Every thing in medium & low res model use efficient texture map and a procedural shader for whether (old) effect, a good model is judged by its UV mesh after the shape, most 3D modelers practice build first and map later, I do both at the same time and when the model took shape so as the UV mesh.

This is because tweaked object need to unwrap first before hand, otherwise texturing will be difficult. The roof require Alpha the next are mengkuang and wood, if you need close up, it has to be replicated into rolls of geometric polygons in render time, usually based on the software capabilities.

You build a Honda showroom but a Mitsubishi car passes by? At least make your sky perspective.

3D scene is complicated and there is always sky, tree, grass, terrain and water. Despite using expensive software, learn to make those if the program you use cannot produce it and may require plug-in. Read through th 95 pages for better ways from the people who do the same kind of work.