There are great UX portfolios out there with very very detailed design case studies that are immensely valuable as to the process but I agree may not be relevant to your specific project. Nevertheless, looking through how other designers approached a problem and came up with a solution is immensely valuable. Check this out (yes, I put it together so I'm a "little" biased, but this has been massively researched over weeks and weeks. I'm not selling anything with it just providing info.) https://www.toptal.com/designers/ux/ux-designer-portfolios