Useful language

Comparing:

• The main / greatest/most important/most significant difference between the photographs is that...



• The most striking/obvious similarity is that...



• In the first photograph,... whereas/while/but in the second one...

Expresing preference:

• I'd much rather/prefer ... than...



• I don't like the idea of... so I would prefer to...



• I'm not so keen on (interested) ..., so I would choose to...