I say that because I believe they are good drawings. It would be cruel if I didn't share my honest opinion of them professionally. Seriously, I am speaking from experience, don't let doubts and fear decide for you; decide to do something in spite of doubt and fear.
The only time you really fail is when you don't try; because when you don't try, you hurt yourself and learn nothing.
No matter if te attempt succeeds or doesn't, you can come out the better if you try to learn from the successes and shortcomings of those attempts and build off them.