A2 English Language Investigation: Language of Charity AdvertisingWatch
What is your title? Looking at more than one genre might make your study more interesting, but it also adds another variable. Maybe consider adverts aimed at different audiences. Are you looking at print, television, radio or online advertising?
My title is looking at Power shown through charity advertising and it is online advertising
It might be better to look at different genres within the charity theme, such as comparing those raising money for environmental causes, the elderly or disaster relief, to see if they all use the same methods. Alternatively, find adverts aimed at different audiences, such as teenagers or older people.
There is a short summary of features that you could look for here ; I would also think about 'politeness'.