Masking tape tears paper off!
There are a few tricks of the trade for using tape on drawing paper. Here are some of them:

Use good quality paper.
Try using different types of tape to see which kind works best with the type of paper you're using.
Stick the tape to your pants one or more times before sticking it to the paper.
Don't leave the tape on the paper for more than 24 hours.
Remove the tape slowly, pulling away from the illustration instead of straight upwards.
Use a blow dryer or heat gun to heat up the tape slightly and soften its glue before removing it.