Profile Image:
Fiverr profile picture size should be at least 250 x 250 pixels
Gigs Image :
Recommended image size is 1280 x 769 px, 72 dpi
Minimum: 712 x 430 px , Maximum 4000 x 2416 px
https://help.fiverr.com/hc/en-us/articles/15863342952977-Gig-Images-General-Gig-image-guidelines
Long Story Short , Well Title , Detail Description , Understandable and Attractive Images and video . use only gig related tags. some Q.A . its take time for 1st order . share gig links on social sites and when get an order work hard .
No you don't need to do that , if someone did bad and not get caught its doesn't mean you are lucky as well . use your stuff even its not much good , customer prefer buyer own portfolio.
Long Story Short ,
Well Title , Detail Description , Understandable and Attractive Images and video . use only gig related tags. some QA .
its take time for 1st order . share gig links on social sites .
Click (top) My Business -> Gigs
there your all gigs will show just simply click on one of your gig it will expand and show info about performance.
2nd method if you are "Seller Plus" Click (top) Analytics - > Gig Performance
and a page will show of some kpi information about your gigs .