Hi April,
I love the look of your site! Very clean and pleasing to the eye. As far as the copy goes, there are a few things that I noticed and thought were worth mentioning, since you asked for constructive criticism and all.
One thing is the newsletter sign-up request. It might help to get a bit more specific about what readers stand to gain from receiving your newsletter each month. Will they learn tips and techniques that will help them sell more houses? Shave ten hours of busywork off their schedule each week? Might help to add some specifics into the copy under the sign-up form and then change the headline a bit to be more attention-grabbing. Instead of "Monthly tips" maybe it would be "Money-making tips" or "Time-saving tips," whatever it is that is related to your monthly newsletter and will grab the attention of your target market and make them enter their name and email address. Would also help to have some sort of giveaway, like a free report or free downloadable audio that reveals a time-saving or money-making secret or two, that they will get instantly once they sign up.
PS: I'm glad to hear that you're starting to find success with your website!