Antique De Porceleyne Fles Tiles / Plaques

I've just today received delivery of a pair of de Porceleyne Fles tiles, bought online for a relatively modest price (in my opinion). They measure c. 20 x 20 cm, are in undamaged condition, and date from c.1889 according to my research.
I was intending to sell them on and use the proceeds towards any future purchases. However, as my wife has taken a shine to them, it looks like they'll be staying here for the time being - and I must admit to liking them a little bit more every time I look at them.

Anyway - I was wondering if any Delft experts out there would be willing to give their views or comments on the desirability and typical market value of similar pieces - not that they'll be sold anytime soon.
Sorry about the quality of the pics - they were taken in the evening without natural light,

Many thanks for your comments.

 

I think this is the artist on one of your tiles. From Discovering Dutch Delftware by Van Hook.

 

After David Adolphe Artz, 1837-890. He would have painted them in Scheveningen or Katwijk, fishing villages near The Hague.