Greetings @Lena_viz !
Welcome to the Unreal Engine community! 
I am moved by the design of your architecture. The orb and the concave shapes bring a natural feel to the environment. Is the home a sort of biodome with the water coursing through it? What a beautiful concept - a structure that serves a symbiotic purpose with nature!
I looked at a few finished and conceptual works by Claude-Nicolas Ledoux, and conclude that yours is an ode to the House of the Surveyors of the Loüe River. I really am impressed by your modern take on the design!
Should you decide upon improving the water animation and include interior views, please post updates! We would love to see your progress!
What are your goals for learning UE? What about the Unreal Engine would you say would improve your experience as a 3D artist?