I'm probably not the best person to answer this question, but I do some experienced hiring into technology and business fields, and a fair amount of recruiting overall. YMMV.

Two main points:

1. Don't worry about your resume too much. You're probably not going to get your next "real" job off your resume alone, so your accomplishments, projects, relationships are going to be more important anyway.

2. As in any position, you have to clearly and concisely show what you did and the impact you had. That's almost easier to do as a freelanced because you did it all. There's value in that: it's just at a different scale than a larger business. I'd wonder if doing something simple like incorporating your freelance business (so it shows up as "Buzzword Consulting" and not "Self-Employed" on your resume) might yield a stronger emotional response. ("He owned a business!")