Hello!
You can't go wrong with a Japanese back piece (with a good tattooer of course)
For me my downfall was definitely rushing into getting tattooed and getting tattoos from people because my friend or work colleague did. I started my Japanese sleeve and from the get go the guy didn't really like my ideas of thick lines with simple bold designs. He was more into heaps of thin lines as he preferred tattooing monsters and zombies and stuff but had done a lot of Japanese. He did a half sleeve Koi on a friend so I thought okay he's the guy. I had 2 sessions for line work and 3 sessions of colour for what was the top half of my sleeve and onto the chest plate. Around that time instagram was getting huge for tattooers so I saw a lot more quality work then I'd ever seen before. Previously most of my Japanese tattoo exposure was in magazines where shading detail and line consistency is hard to notice so having my own tattoo and seeing it up close every day was really something different. When a friend shows you a tattoo you see it for a few seconds not days, weeks, months, years etc. So I put the sleeve on hold and eventually learned to notice correct shading and lines just from looking at hundreds of tattoos a day on instagram and not only does your eye get better bet eventually you come across the tattooer you want to work on you.
So to summarize haha research is the best thing to do. With Japanese there a rules that I don't know about and I bet a lot of tattooers don't either so you need to find someone who has really studied their Japanese tattooing and if you can follow them on social media you will notice their trademarks and styles on a broad scale and you will know who if the best tattooer for you.
Another good thing with Instagram is there are people who post photos of old Japanese woodblock art and sculptures, ornaments, masks etc and they are great references for Japanese work. Definitely look into woodblock art because some of those scenes would make the greatest back pieces. Check out Fuji Arts Japanese Prints - Japanese Woodblock Prints and Decorative Arts
As for photos I'll try and post some in the next couple of days