Alright, not bad for a first. A few things though: Its really small, and I cant really seem to pick up all the detail out of it. Also I think you saved it in the wrong format because I can see some colour distortion, make sure you save it as a PNG. Another thing would be that the rune armor is too bright and only the plate is included. However being an artist from the start, which you are, theres alot of potential for you to become a good pixeler. Try making something on 300 x 150. First sigs are always incomplete and need improvement so just remember, you'll have to keep practising but you will learn something new after every sig you make ;)