So how are the seasons marked in your fictional world? Are they the same as ours in terms of having a season in which the land is barren, another where the land and nature in general comes to life, another where everything is blooming and a final one where everything winds down ready for the barren period again?
Is your fictional world one in which agriculture is important (with therefore more of an awareness of the importance of the seasons)? What is the climate like? The general weather patterns per season? What does your character(s) think of the seasons, which is their favourite and why?
In a magical environment, can the seasons be tampered with to cause havoc (the only reason to do it I think!)? How does the natural environment of your world react to magic being used against it? Can it find its own way to fight back, the same way our natural world has a habit of kicking back against abuses of it? (For example, deforestation. Yes we strip away the trees without replacing them, then there's a drought, no water is retained in the ground as there are no roots to hold it, the drought is far worse as a result).
What impact does the seasons have on your story and characters?