Lots of places around Seattle for Photography.
Pike Street Market, Water front Park, Myrtle Edwards Park including the Olympic Sculpture Park area, Discovery Park in Magnolia and a visit to Magnolia Bluff with its great views, Seattle Center with Space Needle, Glass Museum, International Fountain, Glazers Camera (Republic and 8th Ave), Center for Wooden Boats in South Lake Union, Fremont area, lots of interesting sites including the Troll under the Bridge, Lenin Statue, including a walk along the ship canal, Hiram M. Chittenden Locks (Ballard Locks), Volunteer Park with the Seattle Asian Museum, the Black Sun scultpure, reservoir, and great view over to the Olympic Mountain range, and right next door is the Lakeview Cemetary where the founding families of Seattle are interned along with Bruce Lee and his son Brandon, Greenlake which is a great scenic walk with lots of people to photograph with the Woodlawn Park Zoo close buy, then there is the University District with the University of Washington Campus along with the Monlake and Washington Park Arboretum, walking down Broadway on Capital Hill and a visit to Cal Anderson Park and the Elliot Book Store and Seattle University Campus is right down the street across from Photo Center Northwest.
You may also consider a ride on the Washington State Ferry System from the Seattle Waterfront, Seattle to Bremerton and back will take a couple of hours and offer some great views of the city and surrounding mountain rangers and islands while traveling across Puget Sound waterway.
A little ways out of the city, 30 to 40 minute drive, you will find Snoqualmie Falls which is a worthwhile photo opportunity with its 270 foot waterfall.
Just lots of places in Seattle and the surrounding areas.
If you have any questions, send along a PM, if you are in town and want to meet up for a walk about let me know, I would be happy to catch up with you if the timing is right.