I have used some Copic Markers and a fountain pen.  I have limited my palette for 2 reasons 

1. I do not have  many markers 

2. I did not want to overwhelm the composition with too much information.  I feel like it is busy enough with the shapes without adding a wider range of colour. 

I have not yet decided if I am happy with it but since it is not done with software it was not really possible to make small adjustments 

I had a go at using a digital art program (ArtRage) thet next day.  Never really used it much so I was struggling to do this but here is the result.