Hi JacopoGrosso!
Thanks for the comment on my work, I meant to reciprocate sooner. Your interior is really nice, my only comment is that the reflection in the mirror is a bit confusing, seems like the water level is higher than outside, and with that shallow and angle I'd maybe expect to see some sky in the mirror too. Maybe it's accurate, I just find it looks more like a small window than mirror! I'd maybe lower the contrast on the exterior image a little too.
For the exterior, I'd work a bit more detail into the building model itself. I doubt you'd have wood cladding going right down to the soil like that so maybe add in a plinth. The sky here doesn't really match the render, as the sun seems to be setting in that direction where as the scene appears to be lit from behind camera. Lighting wise it's a little flat and overexposed. Also, is that a hole at the back of the interior?
Good work though, a little more work on that exterior will go a long way. Hope my critique is helpful!