What Size Prints Should I Get?
The bigger is better! The rule-of-thumb is that your art should take up somewhere around two-thirds to three-quarters of the space above whatever you hang it. Couches typically range from 72-96 inches with the average being 84'. A queen-size bed is 60' wide. You can combine two or three smaller pieces of art to take of that space too. You'll also want to consider whether you're using portrait (vertical) or landscape (horizontal) images since the width of each one is what you need to take into consideration here. If you aren't sure what would work best in your situation, reach out, and I'll happily provide my opinion.
What Medium Should I Get?
The answer is a very unsatisfying "it depends". If you have very unique decor, getting a paper print can be great because you can customize the frame to compliment everything around it. But frames and quality class are expensive and provide glares. If you have lots of light and want to avoid reflections, canvas can be excellent. Both acrylic and metal offer very clean, contemporary looks. They are more expensive, but they come ready to hang.
Photographic Paper is the classic option and allows you to get it framed to fit perfectly in your home or business. It's also the most affordable medium.