Hello,
Curved walkways can be absolutely lovely - so long as they look like they are curving and not just wiggling from point "A" to point "B".
Look at the bend and flow of an old stream - the stream changes direction when it arrives at an object it cannot move, the water moves around the object, emphasizing the fluid nature of water by the path it creates as well as the relative permanence of what it diverts around. The curves of a stream are not random.
You get a sense of this in the "example" pathway you have included. The water seems to divert around a large boulder (actually a large, evergreen shrub), meanders across a plain (the lawn) and curves away again when it meets up against another unyeilding object (the low, stone entry wall).
Creating the effect of "flow" does not rely completely upon what is located on the ground plane - give the curves a reason for being where they are with the addition of landscaping.
The two ends of the walkway are both "collector" points, they should be more generous and the curves open outwards a bit rather than abruptly ending.
If you are really panicked, try laying out garden hose or clothesline to work out the effect you are looking for. Don't be afraid to lay out a few empty buckets or such to approximate where shrubs might be located. Do allow room between the house and walkway for plant materials.
Have fun!