Design a Website Mockup Shopping Portal

Dear Freelancer, I need a professional well experienced designer , for my website we need to make something nicer than flipkart and amazon such website , i can only consider once you show me one jpg demo file for mockup We are entering the same business so need you experts help for a eye catching website design. I don't want to create a milestone at this moment because , i am not sure what you are going to show me but yes once you show me a design i will consider to do the instant payment. I don't want any original file before i pay you effort , i want first judgement whether you can do my requirement as professional manner or not that's the things which is very much essential for me , thank you .