Shade Gardening: Help me plan my plantings for this corner shade garden, 4 by Weerobin

Weerobin wrote:
I wanted to post a couple pictures of my cornus alternifolias.
The first is the straight species blooming quite nicely in dense shade.
The second is the Golden Shadows variegated cultivar.
I think it's beautiful all summer long and so far seems quite vigorous.
The 3rd is the all-gold Gold Bullion cultivar - not a great picture - it's really bright.
But the brightness fades later in the summer.
Finally, my puny kousa blooms ('Satomi') on a plant reaching despirately for sun...