Yes, Here is my portfolio on Behnace which showcases my previously done pixel art projects including both static and animated design. https://www.behance.net/syedahumna
Also you can check my fiverr profile here, https://www.fiverr.com/syedahumna56
Yes of course. Although after completion, I state that customers take 100% ownership of my work, I still maintain copies of my best work for my personal portfolio. So here are some examples.
You can find some of my pixel art work here on my portfolio website: https://www.ashemritte.co.uk/pixel-art-portfolio-1
Or here, on my Fiverr: https://www.fiverr.com/ae1996/create-pixel-art-for-you?source=order_page_summary_gig_link_title&funnel=ffced49bb4cf47a989bb55e9561696b6