It's quite close. The main plot and characters are mostly in line with the comics, with just a few tweaks for the cinematic adaptation.
Overall, Tank Girl is reasonably faithful to the comics. Some aspects might be simplified or adapted for the screen, but the core elements remain intact. The visual style and the essence of the story are well-preserved.
Tank Girl is known for being relatively close to the comics. It manages to capture the unique charm and spirit of the original comic. Although there are inevitable changes in the transition to a different medium, it still respects and builds upon the source material.