Remove the random shutters on the one window.Relocate the house numbers to reinforce the main entrance and treat them as an accent graphic, vertically of horizontally as @Marcia Maynard suggested.Make an effort to carve out an area of the lawn to identify the main entrance with landscaping that leads your eye up to it. 

We've been trying to "get creative" by looking for SFHs with finished basements that have a separate entrance--with the idea of adding a kitchenette and bathroom if needed, and renting it out as a studio.

Hook up with a few investor friendly REA's, and let them supply you.The bottom line of how comes from your answers to three questions you should ask yourself before you go any further:1 - What are your financial goals...as in your financial needs monthly and for total payoff of your personal debt.2 - What Market (Micro-Market actually) will deliver properties with financial profiles that will satisfy the needs from Q#1.3 - What Entrance/Exit Strategies (this refers to money...not "flip", "hold", "land contract", etc...) can/will you use to deliver the above 2 Questions.Only you can answer the above three questions, because they are specific to you....and a hint:  None of the answers involve a "%".

It was easy to spot since it was a corner property with 2 separate doorway entrances (one in the front and one in the side towards the rear of building).  

A few are at eye level to get a nice view of the entrance hallways.  

This summer we were gutting the lower unit as part of an energy efficiency retrofit and rewired the entire building, plus moved the entrances from the back of the building to the front corner (which required installing 75' of buried conduit) ... the total bill was about 16K ... not cheap, but it would have been more if we were not opening up the walls in the downstairs unit ... being a balloon-framed house, between the attic and open walls on the first floor , it was easy to fish wires ... and then install all the fire stops.

Ours were gas lights of old & were also piped into the center plaster medallions of both the living & dining rooms but were similarly positioned on the walls in the kitchens & the entrance foyer.

That is tenant is now gone, but the new tenant is not getting a storm door.If you have a quality entrance door, then a storm door is not really needed.

Now I'm on an entrance street into the same subdivision, the "upper-class" section of it.

Things that come to mind are bars around windows and a heavy metal security door over entrances.