According to the current law, you are called a "job work", and the author should have a labor relationship with his unit, and the works he creates should belong to the author's scope of duties; The use of a work shall be within the normal work or business scope of the unit to which the author belongs. The copyright of post works belongs to the factual author, that is, the natural person author. 、

Therefore, the renderings you completed in the original company are copyrighted. Of course, you can use them properly when applying for a job to prove your business ability. Of course, to be on the safe side, it is enough to indicate on the job application materials that "this picture was completed during my tenure in a company".