It's really your choice. The snake looks very healthy so if you want to feed biweekly you will be fine.

I feed my younger snakes weekly but my older blood get two large rats every two weeks and the rainbow feeds every three. Honestly I like being able to space it out to every couple of weeks.

Just don't feed the same size weekly that you were biweekly. Unless your snake has a gym it will get fat which can lead to other health problems.