Nice thumbnail Adarias. Thanks for reminding me to get back to perspective/enviro studies. I've been faking things for far too long.
Not using an eraser is a great practice. I vote for not marking the 'bad' ones with an X as you might find a way to improve them later. You just never know 
Yeah. You never know what you'll see in your shitty drawings after letting them sit for a few days/weeks/months. And all those searching lines in a sketch can end up morphing into neat details. When erasing them you could be erasing your best idea ever and not even know it. Its the passenger approach to art. Passenger vs driver. Its good to switch seats a lot throughout the process of art making.
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I've been redesigning my creatures from October. I've started with the shittier ones, for the challenge.
rendered:
I ramble about my process on my blog:
http://burhtun.blogspot.com/
