Character animation is the most time-consuming stage of development. It requires patience and skill. But here, too, there are tricks. First of all, you should define the basic techniques of animation, which will be used in the project. I do not need to tell you about the twelve principles of animation Walt Disney.
First, all animation within four frames. In my experience, I can say that this number is enough.
Second, a new frame is created by editing the main thumbnail. It is not necessary to draw each frame anew. With the help of puppet deformation and distortion tools you can achieve good results. Usually, one frame of my animation consists of two layers: the first has an outline, the second has a painted area within the boundaries of the outline. This design is easy to correct and add new details.