Some nice shots there, but are you saving them from GT4 at the highest possible quality? If not, then you probably should, since they look a bit pixelated to me - either that or you could try resizing them - typically, making them a bit smaller helps to sharpen things up a bit. You could also try doing some basic processing in a photo manipulation program like Photoshop (or Gimp - I think this one is free...) - but you need to start off with as high quality an image as you can get 👍