What would you do???

[Poppytree]

I rather like the black outline - definately for the shoes.

Another alternative is to maybe pick the predominant colour of each block and stick with that - pink, lilac, pale blue, green .......

Most of the images I found use black but they also use brighter colours - your pastel shades are beautiful and the black may be a bit too much.

Difficult descision - I'm sure whatever you choose will look wonderful