I'm going to try to be as helpful as I can,
try making something original, simple/bucket fill packs have been done way to much, and nobody likes them,
try not to use the default textures at all, make your own stuff completely from scratch,
and add some detail once you've figured out what you want it to look like.

Edit: you may also want to look up some texturing guides

Thanks for the tips, though I didn't just fill them in with bucket fills, I did actually work on some blocks for quite a while. However, I still appreciate your feedback. I'll make another texture pack, but I'll keep this one on the site. Thanks again!