Looks good to me and I also noticed the bow was a bit tight. At its narrowest, a #2 pencil or towards the end of your little finger, should just clear the space. 

given people’s fingers are different sizes, the finger option always seemed relative. But, check your finger once you have done the pencil check and see about where on the finger it is about the same. Then, you will always have a check with you if no pencil is available, and also see what the bow looks like. You can also count your turns for a rough idea, too. Many options until th bow tightening becomes natural.