The JJBA manga is indeed finished. It had a great journey and wrapped up with a satisfying conclusion for fans. However, there's always the possibility of spin-offs or related works in the future.
Overall, the JJBA colorized manga is excellent. The color choices are well-matched to the tone of the story and add depth to the panels. However, some purists might prefer the original black and white version for its classic feel.
The order of JJBA manga is determined by the release dates and the development of the plot. You can start from the earliest published volume and continue in sequence to get the full story experience.
The coloring in the gappy JJBA manga can vary depending on the edition or fan-made colorings. Some are quite vibrant and true to the original style, while others might have a more unique take.