If you want to paint thing that are not in the world in front of you, but have a lot of good detail you can make small studies (sketches) of textures shapes anatomy etc. and use them as reference when you work on your painting.
This is NOT abstract art though. Abstraction means to reduce something to its basic essential qualities. In painting that means reducing the idea of painting and the materials to their basic essential qualities (surface, color, form, and flatness for example). There are different types of abstraction (Lyrical Abstraction, Abstract Expressionism, Geometric Abstraction etc.) but one thing they have in common is that they are not representational in they way that you want to be painting.
