I made this card a little while ago and saw that the technique challenge this week was diorama cards so I thought I should upload it.
I did an oval opening and brayered the sunset scene on glossy paper on the back panel. It was really hard to get a good photo of this - it does look better in real life. The wave effect was done with wax crayon resist. The centre piece was stamped with grass and torn a bit to look like dunes and layered on blue paper for the sky. The idea is the couple is sitting on the dunes looking out at the sunset on the lake. How romantic!