I would perhaps put ths suspension members in the inside of the curve of the pedway instead of outside. Unless the arch is a decrative feature and not structural. If they are on the outside all the weight will be born by the curved portion of the suspension member (not to effecient). You could instead have that born by support beam under the pedway. You could if moved the support to the inside curve connect that to the lower curve of the arch to keep the spiderweb effect. You could of course do both at the same time. Perhaps run a curved piece over and a straight piece under.
From an engineering standpoint
There are more loads on a bridge then just the pedestrians of course. Wind for one. This is a big factor in the engineering of the bridge. As this is perhaps quite a bit greater then just the people walking on it. With that in mind you may want to make the arch a bit more wind friendly. Depending on the recorded wind speeds and direction at the bridge location. These are usually exceeded to a degree. The overall wind speed for the city (it’s maximums is usually a good judge). They will use the higher of the speeds for the engieering of the bridge.
The change in the design would not include altering it’s shape just the structure. Basically you have to cut out the Bernoulli effect (wing). You can use aircraft design eliments to counter this or you could change the arch’s structure to compensate (open it up a bit more) with slats. You could of course have an entirely open structure (space frame). This would eliminate the Bernoulli while still maintaining the shape of the wing.
Another good source is that of Coasters. It is much like that in shape.
If you don’t give the wind the room to move through the structure it will want to move the structure. This will force you to add more support to hold that movement at bay.
There is a whole cost/benefit analysis that happens. The amount of material in the superstructure versus the cost to build a more complex structure to reduce the materials. A bit of balancing act in many cases. Labour vs Material. Many times a pedway is used as a demonstration piece for a larger engineering project.
That said it’s quite an elegant design. All of the thoughts of cost are mitagated by the actual looks of the bridge. This one is very impressive. There is a certain amount of community pride and engineering skill being shown here so that is also part of the equation.
The “Trick” if you can call it that is to use the forces for you in your design. As well as hiding the structural parts you find unattractive. You could hide the added structure of the bridge in the pedway. Atleast cut the load baring to a percentage of the total load. Part of the load is born by the arch and the other by the pedway. Bernoulli is at work on the deck aswell - just not as much as on the arch. This effect is the result of the height above the water surface. Air can’t move below the surface of the water so it will want to squeeze through between the surface and the deck of the bridge. You can use this to your advantage in the arch (as you may be doing already).
It’s quite an impressive design and good render and composit. With a bit of engineering you could make this into a viable design. I wouldn’t discount the concept of sending it off to the city for concideration. Not knowing your city (goverment). In the city I live in often there is a compitition for such things.