- Nobody can tell you what body fat percentage you have, even if your picture showed more than just your arms.
- You stand wherever the hell you think you stand.
- Your future training strategy depends entirely upon what your goals are.
- Nobody can tell you your "ideal". It's yours.
Assuming you didn't do manual labor for years before strength training I'd say you've made very good progress.
Edit: I'm not meaning to sound harsh here. It just is what it is. If you have an idea of your goals then share them and people much more qualified than I can help you. If you're happy with your progress, and I hope you are considering you have big fucking arms for a guy who's only trained for five months, then keep going and enjoy the process.