Doodling is certainly a good start - I'd say that most of your folds would benefit if you tried to fold cleaner. This is not only a matter of precision, but also of dexterity in general. Try to come up with ways that hide the layers of paper that need not be seen in thin points, for example.
ODS is a marvelous book, but it will not show you how to be a better folder, right now I'd argue you're not short of ideas, there is no urgency to get the book, but you should try to fold with more patience.
I have no idea whether any of this makes sense to you, just believe me that it's meant kindly.
Some of them have a 'Jeremy Shafer' look to them. Do you come up with models by doodling?
cow burgers scorpion 
