It's been my experience that most people, including those experienced, qualified, &/or published, are generally receptive to cold emails within their field(s) o

It's been my experience that most people, including those experienced, qualified, &/or published, are generally receptive to cold emails within their field(s) of work or interest. My format is typically a ~3 line email: first, I mention how I came across them, which is often "I was reading __ and saw your comment," and usually where I found their contact info. Next, I intersect my work with theirs; in the case of comments, often that is already contextual "you mentioned X and Y, and I'm working on Y and Z." Last, I'll present a simple structure of what I'm trying to learn, how I think they could help, and ask if they're interested. In your case that could read something like "I'm looking for a critical review of my design, because I might have missed something obvious. Would you be interested in helping? I think {small amount of time} would really keep me in the right direction. We could {preferred communication method, like video call} or {alternative communication method, 'or I can email you the design'}" I consistently receive replies from >80% and more than half of those conversations yield incredible value to my efforts. These days, I like to offer some form of compensation in my cold contact, out of respect and for efficiency, but it's not required. Often this gesture is welcomed but unnecessary! Being thoughtful, curious, and organized in your outreach are the key components for this strategy. Best of luck!