Something looks odd in those two pictures to me.
The 2 X 4 blocking to space out the rafter is shown differant in the two pictures.
If it was done like the bigger picture I would think the whole thing would sag.
Your counting on only 1-1/2 to support it. Turn them the other way and it becomes 3-1/2".
Around here even with light snow load we cut into the rafters to the second rafter back from the wall, to be 100% sure the end of the roof does not sag and use 2 X 6's instead of 1Xs for the fashia