Get a soil test done, specifically a pH test. If you have acid soil, there are a fair number of options. With a higher pH and a northern exposure, the number of choices falls off drastically.

Hi, depending on how the soil checks out, some nice choices include rhododendron, azaleas, Japanese maples, numerous dwarf evergreens, to mention a few.
The soil can always be ammended, too.

ciao

Nagamaki your photos on your web page are lovely. I currently have 1 rhododendron, 1 azalea and 2 evergreens in that spot, one coneshaped one George Jetson style. I will get the soil tested so I'll know what my other options are.

In that case a Japanese maple might be a consideration. Many shapes and color combinations from which to choose. If your other plants are fairing well, it sounds like the soil should be fine.