Ah that's defiantly a silly way to do it. In your stack have (bottom up) editable poly then symmetry modifier. This will allow you to mirror everything you do by simply clicking up the stack to it. Saves a enormous amount of time and you can see where your model is going alot faster. It even welds the seam for you.
I wouldn't say your doing it wrong. It's a step in the right direction but i would advise starting over. This should help a little i think. Anyone else feel free to crit the forms but i think there right. After you got the lowpoly block out you can easily add more detail since the poly flow is relatively good. Also, are…