Ah, many thanks, just what I needed ... good solid advice (and a spot of encouragement too)!
There's just one interesting note that I'd like to add ... I ran a more snazzy looking advertisement by a bunch of people at the local college who specialize in advertising (part of the business department) and they said to tone it down a lot.

In fact, they wanted me to make it primarily grey, brown, and black

... it looks like I should have disregarded them and basically made the ad as bright and striking as I was going to originally. They had some theory about people feeling 'threatened' by my original ad ... and let that be a lesson to me too. All I've heard though, since I started is, "it's too bright." "It's too dull." "You should have a picture." "You shouldn't have a picture." "Your font is too fancy." "Argh, that font is so plain -- looks like something out of a textbook." "More color." "Less color." This aspect is probably the most discouraging part of all, that every change I make in the outward appearance of book, website, ads, etc. seems to be just as displeasing to the critics as the last one. Damned if you do, and damned if you don't, again. I'm not complaining per se, it's just that it's hard to gauge what the public wants when they seem to dislike their own suggested changes just as much as the original look....
As for the text in the ad, my mistake was probably having any text at all. If you look at most of the ads in Dragon, they are just a picture of the item with no description whatsoever. But it's moot, since I can't afford any more Dragon ads at the moment anyway.
However, to return to the topic ... I'll take all of your suggestions, many thanks for the help, and if you think of anything else, please funnel it into my ear!
