Something like that would probably work fine. Very cute--you have a great eye for patterns!
However, as I said before, you don't have to start with a garment that has darts. You can add all of your dart shaping from scratch. In fact, you may want to begin with something similar but a little less fitted--kind of a generic top (I know that probably doesn't help you much!!) The reason I say this is this: if you start with a garment that's close fitting, it's trickier to get the fit exactly right and it's more noticeable if you're off. Whereas, if you start with a basic blouse (for example), if the fit is a little off, it can still be worn and you will have a sense of accomplishment and a successful learning experience. The dress Robin showed is more of the fit I'm talking about, not tight, not loose.
Once you've learned how to do a basic FBA, you'll develop the ability to shift dart placement around. Then you don't have to depend on a pattern company to tell you where the darts are--because you can but them wherever you need them.
Another resource for you--Singer had a great book called "the Perfect Fit" that is my starting place for all FBA's I do. Lots of illustrations and examples. How to add a dart where there isn't one, how to make an existing dart bigger, moving a dart, dartless bust adjustments, etc etc. I think it's still in print in some form or another.