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

But, I was hoping any of Du 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, oder 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*