Looking better

The lowest temps you want for a BP at any given time is 75f.

If you have a lamp or something that emits heat, i'd suggest putting it on the top of the cage so it provides some heat. Also, cover most of the top of the tank with a cloth (away from the lamp of course!) to keep heat in better.

Doing good so far though. Kudos to you for taking the snake in and caring for it! Looks to be in relatively good condition by looking at those pictures.