Is it possible to add a 'photo upload' section to a form?

[#1]

I'm a tattoo artist and I'm using square for my art sales and ideally I'd like to use it for booking inquiries as well. 

I've built a page with a form to fill out, but the one thing missing is the option for clients to attach reference photos to their request. Without this feature I don't think I would be able to use the online form since most of my clients send reference images for their ideas. 

If theres a way to add that option that I'm just not seeing please let me know how to do it!