Advertising is data on the opposite demand front and data visualization is simply a form of compressed data (efficiency of learning).

Seller will convey the Property to Buyer at Closing with marketable title in fee simple by transferable and recordable general warranty deed, with release of dower, free and clear of all liens, encumbrances, conditions, easements, and restrictions, except for: (i) those of record which do not interfere with the intended use of the Property as a permitted use under the current zoning for the Property; (ii) those assumed by Buyer; or (iii) those which are open and notorious or which could be determined by a visual inspection or survey of the Property.

If it's retirement income then I'd stick with the cheapest renovation possible improving the property and increasing the value a lot of times landscaping and or grounds work done improves the visual there by the perceived value and that can be done while your father lives there. 

You should add some before and after pics to this post so that people can visually appreciate the work you did.

Of course a major concern is starting off on the wrong foot and that potentially becoming a negative deterrent for me. 

The idea is based on the stairs being a deterrent for bad guys sneaking through the house.

That's a great idea, get several different types of foliage and colors for visual interest, plant in groups along the fence and next to the house.Post "after" pics when it's finished!

Seeing the property gives you the visual as opposed to a lead source.

Latent defect is defined as a defect that is not easily found by a careful visual inspection. 

Install the security cameras as a deterrent.