It's CnC time!
You have built some intricate patterns, though, I don't like the squared paper. I know that it facilitate the drawing, but it's better off with office printer paper. They are cheaper if bought in a stack. They get yellowed, sure, and the crease if you rub and doesn't have indents for the pencil - but they are best for you to practice on. Use kaleidoscope and Celtic pattern first, and built up from there.
Get GIMP - gimp will help you clean your scans(scans, right?) - it's a free, but powerful software. I will make a tutorial using GIMP for cleaning scans. And to resize it in a comfortable size.
Some of your images look halves? Get an account in Tinypic and Photobucket as well.
For the last ones, buy a couple of 2B, 4B and 2H pencils - they are specifically made for drawing, unlike the HB pencils(which are writing pencils).
Get some cash and buy Staedtler Mars Lumograph pencils - they are one of the highly available pencils, and one of the best, too. They are either sold in sets(expensive) or separately(cheaper) - get pencils of those aforementioned pencil Values.
Anticipating for more. KIU.