he bro, to bad they r so dark I had the same problem just put the exposure as much as possible they'll look very light on your ps2 but when you transfer them to the comp they r oke.
The only thing these pictures, as is the case with nearly all first time GT4 photographers and has already been posted here: brightness.
The first photo is great, but is let down by how dark it is. If it was as bright as the Nike photo, it'd be really good (the Nike photo is a close 2nd best).
Keep it up, because its highly unlikely that you'd get worse at taking photos