Very small. Comparable to 3 mm.
Found in backyard, sitting on edge of orb web (see second photo). I taken few shots and it move a little. I changed my position and I saw that it is in the center of small orb web, attached of bigger orb web. (The bigger orb, not very big, less one foot.)
Can be a male, and the bigger orb belong to a female? I did not noticed other spider.
I'm sorry, I wasn't able to take different view or better photos.