You don't need font packs and anyone that says you do doesn't know what they're talking about. The font in my current sig is a stock font, just using warp, bulge A point text ect. is enough for any text.
Keep the size of your sigs to around 450 ish long and 140 ish high. Anymore and you will tend to fill it up needlessly and complicate the process. The bottom of this sig works quite well from a design point of view, you have your focus and centre piece. So other than some better text work and some scatter smudge behind ashley I'd pretty much leave the bg dark or white and render a lighting effect from left to right on ashley to lift it a bit andtake the colour saturation down on ashley a little it seems to be bleeding quite a bit (usually product of a poor quality pic).. i included a couple of examples in my own tags for the scatter smudge technique just to show you the effect in action: