Copying someone's work is crime..!!!
To be a good graphic designer never copy to steal someone's work only copy the great artworks etc, you trace them to enhance your designing skill.
Always keep in mind as a beginner graphic designer you should trace the artworks which challenge you. This way you might learn some new tricks will get more familiar with the tools & the more you work on software the more you learn.
Try to understand the artwork which challenges you..!!
-Note the key points
-Brainstorm how it was made.
-You will soon find your OWN STYLE while tracing.