"everyone else was pounding out these gorgeous pictures of her with seemingly little effort." Tell me about it! :I Well, i like the digital paper-cutout sort of look you've got going here! She looks pretty cool.
Stop beating yourself up! This looks good, it really does. And all of the sketches on your tumblr are all really, really cool. You're not inkydonkey, but that's ok! Only inkydonkey is inkydonkey. You're you, and you've got plenty of followers and we all think you're pretty darn awesome.
Thanks. It's just the stress of struggling with a problem that others seem to have gotten over. Of course it's probably really selfish of me to expect to be able to achieve the same results as someone who's put in way more time and effort. They've earned that level of skill and I haven't yet.
But no matter how many times I tell myself this it doesn't stop me wanting it.
I know that feeling. It's frustrating, I feel the same way I get on tumblr or dA. But you just gotta work through it. It's the only way you'll make any progress, by working at it and never stopping because where you're at just is never ever good enough and it sucks.
It's hard and it's probably not healthy, but what the heck it's art. Have fun, man.