I think it is called Knight's bridge in the center, Soo flowers in the middle and a tangle design by Simone B. but I don't know the name of it.

 I found a site on the internet that had some of Simone Bischoff's tangles so gave some of them a try.  Veilchen, Girlande and Erbluehen are some of them.  The colour is with Prismacolor pencil crayons and a orange Micron pen.

 I used Squish in the center and Pias for the border.  I used  Artist's Loft Markers and a LePlume Blender for the turquoise.

 I used Cockles-n-mussels, Fife and Reticulated tangles and used a blue Micron pen for the Fife background.

 I used 3 distorted circles for the string then added Man-o-man, Fescu and Betweed.  I coloured the center with a Micron pen and betweed with Prismacolor pencil crayons.

 The string is 3 uneven circles.  I used Hurry, Sh'Rock and Vigne by Sue Jacobs.  I edged the Zentangle with 'es'.

 I used Trenthwith, Wimpel by Phine, Leiter and Eyesis by Diane Knauff.  The colour is with Prismacolor pencil crayons.