Now, add the branch. While drawing, try to keep the thickness of the branch the same. It will go in front of the bird, so keep that in mind, too.
Once you have your lines for the branch in pencil, take your pen and go over them with ink. If you want to, erase the inside of the branch to remind yourself not to draw inside the lines. Be careful! Erasing right after drawing with ink can cause some smears!
If you want to make sure it doesn't smear, take a break and get some water to drink, then erase. They should be dry by then.