Is drawing cartoons forbidden, knowing that drawing people is not realistic, and does working in this field lead to entering Hellfire, despite performing religious duties and good deeds, and will these deeds be lost because of something that is not considered a temptation in this era?

Cartoons can be permissible or forbidden, depending on what is drawn in them and what they lead to. Working on permissible cartoons is not blameworthy. However, working on forbidden ones is not allowed, and whoever works on them exposes themselves to Allah's punishment. Nevertheless, this does not mean the loss of their good deeds, for a disobedient person will not remain in Hell eternally.