Hey I've just got my EPQ back from the internal moderation and managed to get an A* with full marks (50/50). I did my topic on robots and cancer, orginally going to do modern medicien but too broad, then wanted to do lymphoma but too specific so just went with cancer. My main advice would be to focus on your planning and research. For AQA, 20 of the 50 marks are for your production log and journal. Aim for at least one good journal entry per week and in weeks where you are writing more, perhaps 2 or 3 entries. Ensure your mid project review, planning review and production review are all in depth and analysed fully - denoting any changes you have made to your structure AND WHY. For your actual writing, you could make it a bit more broad with soemthing like 'To waht extent has media representation of disney princesses affected the development of girls in muslim communities' for example, as this does not restrict you too much. For your main body of writing I'd say make sure you ANALYSE what your writing, its very easy to slip into the habbit or just reeling off data from the internet with very little personal input, i would write about a small part of an extrct I have written and then go through it and explain why it is significant to the enquiry question.
I really like your question title idea ! you could always look at 'to what extent has western media representation affected beauty standards of girls growing up in muslim communities' or something along those lines as it may be a bot difficult to sepcifclally look at disney for lots of data. Some points you could discuss are varying societal normalities between western representations and your own experiences, the theme of modesty and how this has affected your view on it, or perhaps lack of representation. I did 2x interviews with doctoes about cancer and that really helped my report, perhaps look on linked in for a child psychologist and try and arrange a teams meeting (or just email a few questions over), about this. If you complete an interview ensure you include it all in your journal and repeat in your production log as much as possible. The only other comments I'd make about interviews is anonymity, ensure you find out if they are okay with their name being used etc and offer for it to be remained anoymous (just reffering to them as child psychologist 1 for example)
Any other questions I'd be happy to help !