You may try this:
advanced tank with railgun, anime cartoon style, blue as primary color, no text, no typography, no icons, no infographics, single pose, single point of view --ar 9:16 --chaos 10 --quality 1 --style raw
Also you may visit to see about aspect ratio and text in images problems in following topics:
1- Bug with text in images in ChatGPT-4o
2- DALL-E 3 does not seem to understand “from behind”
3- Issue with Positional Accuracy in General Images
4- Aspect Ratio in Cha GPT does not work
5- GPT-4 with DALL-E image custom aspect ratio
6- Orientation problem for vertical images
