It will help if you can master 'brick stacking' (Look at the 'Support' pages).

These might help ... take a clone to copy them.

http://fontstruct.com/fontstructions/show/all_composites_saved_in_my_bricks

It is very difficult to get convincing curves when using a very small grid ... it might help to experiment with larger grids.

Good luck :)

http://fontstruct.com/fontstructions/show/all_bricks_6