hey bro... tutorial section is a good place for you... 35 n 20 credits is way too much for those not so great sigs... tutorial section would love to company you :wub:
Yeah you need lots of practice for selling sigs, and more to sell for that price. The text in your sigs in very poor, and the renders aren't amazing, the second is better, but the first is terrible. one has loads of white in it, and one is 2d the other 3d. Just practice and you'll be alright, but as it is, you have a veyr low chance of selling anything.