I hate to say it, Knid, but the biggest problem with the dome isn't with the space-age look. I think scale is a bit of an issue here, too. I unscientifically measured what you had there, and if the dome is 30 miles in diameter, the way it's rendered would make it about 4 miles tall, which is taller than the stratovolcanoes on the western coast (Whitney, Ranier, Hood, especially St. Helens since it went "foop!").
While I don't have a problem with the theory, I think it is probable that we could see the curvature of the world and thinning of the atmosphere on the horizon at the altitude this picture would be possible at. Satellite imagery would be useful.
And another little thing, if it was that lush inside, and barren outside, and the dome does prevent the passage of moisture, then I'd imagine there's be quite a fog trapped up top. But if it's annoying, they've probably magically dealt with that (magically shunting the moisture down to the crops or something).
I know... picky, picky, picky! Some of the others might smack me down for that. But hopefully, I'm judging your eye for detail correctly.
Also, does this dome have physical weight? Simply based on the picture, I'd imagine so since the look of it seems to shunt the "weight" to the outside. If it does, they might build heavy buttressing around the outsides that might go out for about a mile or so, AND provide you with something to add more fantastic design elements to, since you seem to want to make it more "fantasy".
Just my 2 cp.