The basic shape repeats perfectly.
If this were just empty triangle shapes, it would be an OK and slightly boring
However, if the picture above is a picture of Yoda, the answer is emphatically
"NO, that is not a tessellation" because the blue triangles are air or space.
Those are GAPS.
After Webmaster Sethness explained this to Braden,
Braden changed those gaps into 1950s-style spaceships.
Now, it's a perfect example of tessellation! Take a look at Braden's new version, below.