Sryzovka is copying from a finished image without creative rethinking or some changes.
You can sketch anything and a cartoon from a simple cartoon style, and a complex portrait painted by someone else. Srilling is not a creative process, but a mechanical. You act as a copy apparatus, do not think how you are drawing built, what it is in shape, you just draw a ready -made beautiful result. The complexity of the example depends on your drawing level.
Sryzovka, especially at the initial stages of learning, will differ from the original for the worse, there will be flaws, there will be distortions, the reason for which you simply will not understand without knowing the basics.
Sryzovs are not cute, it is nothing. But if you give out a sketch for your work, then this is plagiarism.