Need help on an abstract painting...?

I'm getting paid a hundred dollars to paint this (see picture)

My mother's friend wants to help me out with money da having me paint this for her. I gladly accepted of course but should've asked domande first. The way I see it, I'm pretty good with painting... but not like this. Abstract painting, o whatever te want to call this piece, is not only NOT my style, but also seems awkward for me to do because detto not my style. Also, I don't know if she wants me to do it exactly as it is, o in my own way. Even then, how could I possibly convert this to my realism-'style' painting? These are just a few domande roaming around my overstressed mentality.

But, I was hoping any of te out there could give me helpful tips, advice, and/or tutorials maybe? I have no other help -I don't know anybody who paints outside the internet. That would be great to get some help from fellow artists, o just anyone who knows painting and abstract qualities very well! ^^

Thanks for reading, and special thanks to those who answer! :D

PS: I tried asking my mom to ask her friend about the whole 'style' thing but she's been no help *heavy sigh*