Past custom references, portfolio and most importantly designer's overall attitude.
How much would you expect to pay roughly?
Too vague to answer...really depends on WHAT exactly you've hired the designer to do. Is it to take a detailed concept YOU give him and convert it into a design(cheap)? Is it to THINK through your technical product, think how users will use it, then design(more work)?
What if the design fails to impress potential users?
I don't know any designer who will guarantee that your users will like the design so this one is tough.
Past custom references, portfolio and most importantly designer's overall attitude.
How much would you expect to pay roughly?
Too vague to answer...really depends on WHAT exactly you've hired the designer to do. Is it to take a detailed concept YOU give him and convert it into a design(cheap)? Is it to THINK through your technical product, think how users will use it, then design(more work)?
What if the design fails to impress potential users?
I don't know any designer who will guarantee that your users will like the design so this one is tough.
-Zaid