Yudi - you have absolutely no right to criticise his graphics by telling him he must improve because they are extremely bad. Whilst Aditya's work is nowhere near world class, your work is hardly brilliant either - in fact from what I remember from your thread, your graphics are equally rubbish.
Mine aren't that great but at least I don't go around telling people how bad their work is.
Anyway, the background and render on the Jonathan Trott signature looked superb - that was easily my favourite - yet the text doesn't work. Try using simple fonts, like Verdana or Tahoma.