I don't see obvious keypoints/lines, but I do see something actually quite uncommon on a small property....a saddle between two high points. This creates the opportunity to catch runoff from a large portion of both hills into a single dam, which ends up being uphill of significant portions of the rest of the site. And most of the area in question, both for the dam and the associated diversion drains, looks like it is under scattered trees and open land rather than thick woods.
It looks like the keypoint for the valley may not lie on your property per se, but that does not mean that you cannot utilize keyline principles on your place. I took one of your maps and put blue colored arrows on it showing how I think the surface water will run as it approaches, crosses, and leaves your property along the northern (up) edge of the map. If up is north on these maps, then the small round yellow circles (near the pond on the north edge of property) are the lowest points in that valley as water enters from the northeast. That is probably why the pond was placed there so it could catch runoff.
I drew black circles around the saddle point that Alder pointed out in his post. Technically they should be further down slope than shown, but MS Paint is a pain to edit in.
Each side of a saddle drains in a different direction so you could have a pond on the north side of the saddle with diversion drains bringing water from the higher points of the ridges east and west - AND - another pond on the south slope of the saddle doing the same thing.
In the valley along your northern edge I put red lines showing how you could keyline plow -OR- place swales to slow and spread the water out across the valley floor.