"Dutch School around 1700" seems to be from the School of Mytens

Deutsch, Austrian auction house, sells on 31 May 2016 a "Dutch School, around 1700" portrait of a lady, estimated at 500 to 800 Euro.

It is a nice enough portrait for that price and reminds me of the works of some of the Mytens, especially Jan or Daniel Mytens the Elder (pictured: work by follower of Daniel, and portrait by Jan), and should probably be dated a little bit earlier than 1700.

The painting is far from good enough to be a real Mytens, but should still be worth more than the estimate and fetch at least 1,000 Euro. It could do with some cleaning to bring out the colour again though.