What happened to mind altering chemicals and certain physical favors Bicc39??? You are mellowing out?! 
Regarding feedback… Watch tutorials, and look at similar posts and see what people have to say. Or not to say. Posts are so similar here that it’s a blur. Once you have reached a certain amount of quality… feedback will come. Before that, only post the best stuff you have, spend some time on it before you post, if you are unsure then don’t post it. Bad posts are ruining your reputation right from the beginning and you will become like me and Bicc39… The old guy’s from the Muppet show…
It’s all so simple, make a good, simple, base mesh, detail it, texture it, done.
Do that many times and when you do not loose interest, which is not a bad thing to do, then you will have presentable and crit worthy entries in the near future.
Do NOT, take a sphere, subd the heck out of it, paint some lipstick on it and present that polyblob as the best thing since the Venus from Milo. Believe me… not a single top row entry is a polyblob. It’s all the simple workflow of creating a basemesh somewhere and then detail it in Zbrush.
Best of luck
Lemo
PS:Have a drawing before you begin and always use references. If you don’t then just look at the majority of ‘works’ in the main forum. People have fun making them, but they are inaccurate and actually a waste of time as a little more prep would already have made more than 50% of the works 100% better. But again, it’s not my intention to rain on anyones fun parade. I just feel that if you do something, you should do it right. Not that I follow my own advice… but it’s a good principle to think about when starting something.