I am a Graphics Designer and I want to Contribute but i don't know where to start or where to contribute Kindly Guide me on This.

Sorry, that you haven't received an answer until now. This forum is in a sad state. Look at the work of the guys from the KDE VDG:
https://vdesign.kde.org/
https://community.kde.org/KDE_Visual_Design_Group

For example Andreas Kainz:
https://kdeonlinux.wordpress.com/
Ken Vermette:
https://kver.wordpress.com/
Jens Reuterberg:
https://plus.google.com/+JensReuterberg
https://www.reddit.com/user/jensreuterberg