I agree, the picture doesn't tell much about the horse. He does look nice, but it would also be great to get video clips (if you can) of his movement, and maybe some conformation pictures as well. When looking for a first horse, it is strongly recommended to bring someone that has more experience with horses, like a trainer for example. How new are you to horses? Are you just starting out? Have you taken any lessons with a trainer? What would you like to do with the horse? Purchasing a horse is a big decision, and commitment.
What helped me was writing down my own goals with riding, and my own checklist for what I wanted in a horse, temperament, age, what the horse has done before, etc. Then I would write done my budget for said horse. I would look for horses in my budget range, no more, no less. When I found a horse I was interested in, I would contact the seller, asking for more information about the horse, as well as pics and videos of the horse in motion. Then, I would relay the info to my trainer to get her opinion on said horse.
"All bonds are built on trust. Without it, you have nothing."