that is a great looking tattoo. just leave it and learn from it, he (the fish monster) may remind you (in time) that beauty is in the eye of the beholder.
here's an idea...put something bigger, brighter and more 'feminine' on the outside of the forearm to juxtapose and contrast the scary merman-monster...perhaps a elegant mermaid with flowing hair and a shimmering tail, tonnes of aqua blues and greens, with finger waves splashes wrapping around to the inside of the arm fading in and around the monster head. That gives you bright/feminine on the outside of the arm, dark/bold on the inside.
but hey, you gotta send us a pic and give me an internet high-five if you use that idea ;)
you'll figure it out, don't rush, good ideas come with time...cheers