conventions of a romance genre!

Characters - a boy and girl. The boy isn't usually 'good enough' for the girl. The parents generally disagree. The girl usually ends up better off.
Mise-en-scene - high key lighting when things are good, low key when things go wrong. Bright colours are used in girls clothes whereas boys have dull colours. Lots of close ups to show expressions on their faces with a lot of two shots used.
Iconography - Dresses, the stream. Birds and flowers. Relaxing.
Narrative - The couple meet and fall in love, but someone disagrees. Typical feud/arguement or something goes horribly wrong for one of the protagonists, and they break up, and decide whether to get back together and try again or move on.
Theme - Love, love triangles, rejection, heartbreak
Sound - relaxing romantic music. 
Diagetic - dialogue, birds tweeting, the couple kissing which reflects the mood of the film and when introduced to the main characters the audience can see that something is going to happen to one of them . 
Non Diagetic - relaxing, slow tempo romantic music to help set the mood

This photo is a good example of a love triangle when the girl loves both males but doesnt know who to choose. If she chooses one male the other one wont be happy.

In this photo it shows a couple in love, and is set in the romantic place of the park which is the main setting of a romance film.