Initial Ideas:

Meaning of Expanding Horizons: If you expand your horizons, you broaden your outlook on life and its possibilities. 

Initial Ideas: I have multiple ideas, these include: 

*Having murder scenes and look into forensic photography.

*Fairy Tales - these expand younger children's knowledge - Red Riding Hood. These set of images would be more fashion, which i havent done before, so i would be 'expanding my horizons'.It would also promote the way that books and knowledge can 'expand horizons'.

*Animals - focusing on rare, zoo animals and how they are usually seen in different places. These would be close ups and focus on facial features. 

*Sports - again these can expand horizons and lead you to new places.  

*Traveling - the views from a car, bus, train etc. These could be country, rural or urban. 
*Food photography - foods from different countries and cultures. 
*Clothes from different countries and cultures.