I am a big fan of feeding my younger snakes twice a week. I personally think that they are much healthier when given smaller meals closer together. Smaller meals are easier to digest and usually allow the snake to be active in a much shorter time frame.

I have been feeding mine twice a week for awhile now and they are all putting on weight. And the weight they are putting on is healthy weight, lean mass not fat.

To answer your question the your snake seems to be a tad under weight for the length. But if it's eating and is active and seems healthy overall you may be fine. What are you currently feeding it? Size? F/T? I would just up the feedings per week, not necessarily the size of the meal. Keep us all posted on what you do and what works for you.