Romantic Comedy - Iconography

Iconography in relation to genre includes visual clues, such as props, setting, costume (mise-en-scene), which help create the aesthetic of the genre, and help instantly establish genre in the minds of the audience.

I have found a useful website which lists a lot of the iconography found in rom-coms, which I have summarised below.

Romantic Comedy Iconography

Flowers - flowers are usually featured in romantic comedies as characters often want to show their love for each other through buying things that are considered to be romantic and show affection.

Kissing - this can happen in any genre, as many films have relationships in them. However, in the romantic comedy genre, when the two main characters finally end up together, there is usually a big scene dedicated to the kiss.

Chocolate - chocolate is also seen to be a romantic prop/gift. On Valentine's Day, couples often buy chocolate, as well as flowers, to show their love for one another.

Idyllic settings - usually in romantic comedies, they have multiple scenes in typically pretty and elegant locations, such as in a park in summer or, for example, in a Christmas movie, an ice skating rink.

Big cities such as New York, Paris and London - Rom-coms are usually set in big cities where a lot of romance happens, sometimes at night with the city lights to create a magical aesthetic. 

Simple, classic settings - such as, a coffee shop, a mall (if American), a restaurant or at a holiday destination.

Weddings - there are sometimes big celebrations such as weddings occurring in rom-coms, as weddings are a sign of love and commitment.

Costumes - in rom-coms costumes typically causal, "everyday" clothes, because romantic comedies are usually about people finding love in their "everyday" lives, even when they're not looking for it. However, they main protagonists may sometimes dress up smartly, for a dinner date, for example.