As long as you have taken the spread and height of your selections into consideration I think your selections will eventually fill in nicely though they might become crowded. Where I live, rhodys get pretty darn big!

I would not have so much shrubbery in there, and I'd spread it out some more, and add a tree in the middle toward the front...and some bulbs, perennials, etc. in the bed. That's a cool little bed and a nice house :)

I would likely incorporate a SMALL tree off the corner or side, depending on what those things look like. (We can't see them.) My thought agrees with sassafras in that what you have here will probably overwhelm the space. It might only be the spiraeas that fit down the road. If there is room around the corner, you might want to use the rhody's or dogwoods to screen some of the deck out of the view from the front. Seems like it would be better to use some color near the walk and some ground cover in front of and to the sides of the shrubs.