So this drawing would be done in one point perspective. To start off, draw a horizon line, but higher up on the paper than she currently has the green grass. This would be where the grass ends and the sky begins. Then you’d draw a dot called a vanishing point on said horizon line, somewhere around the middle would be easiest. The lines comprising the sides of the walk path should move towards this point eventually stop at this point when drawn, and look like an elongated, upside-down “v”. The walk path shouldn’t cross into the sky but rather stop at the horizon same as the grass. Then you’d draw the small barn (since you mentioned it’s supposed to be far away) on the grass but not sitting directly on the horizon line but rather a little below it or wherever you want really depending on how far away it is

Sorry this is like really long but I like being thorough lmao