Two Canadian stamps on the same postcard for this week's Sunday Stamps theme: blue.
The Bluenose stamp celebrates 100 years since this famous yacht was built in Nova Scotia in 1921 as both a fishing and racing vessel. For more on this interesting vessel here is a link to its Wikipedia page. There is also an image of a previous Canadian stamp (coincidentally all blue) featuring the Bluenose.
Apologies for the blurriness of the stamp on the left, it is the 2018 Canada Post Community Foundation semipostal stamp. A clearer image:
Not stamp related, however going back through photos for today's stamps I found this blue image - jellyfish at Newport Aquarium in Kentucky.
For more blue stamps check out the links at See it on a Postcard.