I’ve hired hundreds of people in the last 5 years and read at least 10 times that number of resumes. Other hiring folks read similar numbers. You need to grab them in the first paragraph, and keep them there. Think of it like writing an article. The first sentance is the most important, then the first paragraph, etc. The exclusive goal of the resume is to get you in the door for an interview. You wrote in your OP
But that didn’t come across very well in the first half of the resume. I can tell you that I’ve discarded tons of resumes because I couldn’t figure out what they were interested in doing after reading the first couple of sections. Interviewers are not interested in weeding through each word to find a gem; they want the applicant to say what they want to do and why they are right one to do it.
Start off with a one line objective. Consider putting a General Qualifications section, with 4 or 5 lines telling why you’re highly qualified to do this. Your current General, Editing, and Computer Skills have some good things in them, but don’t cohesively say “I’m the writer you want to hire.” For example, the “French, Italian, German” line should go at the bottom under an “Additional Skills” section. (Unless your goal is to get an Italian writing position.)
Also, Drop the Horse thing entirely. It sounds like a lot of fun and responsibility, but it won’t inspire someone to call you in for an interview as a writer. Same with Activities. Same with Choir and Vocal Coach. These are all cool things, and make you out to be an interesting person, but are really a distraction to what you really want to convey here, namely that you are the ideal writer/editor for the job.
For each job, you’ve listed your responsibilities. Far more important were your accomplishments. Think of things you did at those jobs, especially exceptional things. Same with education.
I would move Education to after Experience.
I disagree with others about the phrase ‘Familiar with issues in usability and human factors.’ If you’re applying for technical writing jobs, the employer will know what you mean, and this is a good bullet.
Personally I like to see things blocked out a bit more. Bullets on lists, jobs organized so you can see at a glance each of the places you’ve worked, positions you’ve held and dates (either with bolding or right justification, or other), but maybe that’s just me. Makes it a bit more organized for my eyes.
In general it looks very good. Best of luck!