Answer:
It all depeads on whats outside of the window and what it is you wand to capture in the painting you are making. for example if its a dull emotion you would like to creat you would youse light colors with hits of black making the small detail with a thin steady bruch and the bigger ones with a semi medium brush. take in note that the size of wherever or what ever it is you're painting affects what material you will use.
not sure it helped but the whole point of art is to expres ones emotions or to discribe someone's exprience. It is importait to not presure yourself to much I think that to art patiance is not the key if, the key is the feeling you put behind it. good luck. UwU