After Tawaaf-ul-ifaadhah, a pilgrim's head was shaved completely but by an inexperienced shaver so that there was some unevenness in the shaving. The pilgrim left the shaved head that way. Is that appropriate?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.

If the hair cut encompassed the whole head as understood from the question, then he has fulfilled the obligation [Waajib] and there is no harm on him if the hair cut was not even or not refined. What is important is that the hair cut should encompass the whole head and this is the Waajib [obligation] according to the Hanbali and Maaliki schools. However, the Shaafi'ee school are of the view that it is enough to cut or trim three hairs.

To conclude, you are not required to do anything (there is no harm on you) and we ask Allaah to accept your Hajj.  

Allaah knows best.