Are there any actual human-created images? I didn't stumble onto any. Maybe that's the point?
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHH
and
HHTHTHTTTTHTHTHTHTHTHHHTHTHTHTHTH
are equally as likely outcomes.
To make it more obvious, let's take just 4 flips. There is exactly one combination with 4 heads:
HHHH
Whereas all the following will give you 2 heads and 2 tails:
HHTT HTHT HTTH THHT THTH TTHH
So you're 6x more likely to get 50% heads/tails than 100% heads. Scale that up to 30; the chances of getting 15 heads and 15 tails is not the most common thing but not unusual. The chances of getting all heads is quite rare -- if every human on earth did this test, we'd expect around 7 such instances total.