This is an interesting one for me, because in my case, I'm not trained. I'm just winging it, and holding onto the rollercoaster.
I've been drawing for years, but it's all self taught. And where writing is concerned, I've even less practice. I'm pretty gifted at dialogue, I can recognise that much; but techniques such as structure, pacing, and foreshadowing are all things I have very little in-depth knowledge of.
So where self-critique is concerned, with art, because I've been at it so long, I can recognise weaknesses and points of improvement quite clearly. But with writing, I'm only just beginning to notice where I could polish earlier episodes, 7 months later. That's distressingly slow to me.
As such, I'm very receptive to critique. But, at the same time, I do know how I want my story to go, and more-or-less how I'd like the art to look. So long as the critique I receive can be moulded to my own vision, I'll do my best to take it on board. (Usually, that just means being more attentive to certain things I didn't know I should be attentive to.) But if the advice I was given meant major deviations from what kind of work I want to create, I won't let it compromise what I know I want to make.
My comic has received way more attention than I thought it would, especially for a sci-fi adventure. So I apparently have decent instincts, even if I don't really know what I'm doing. Hopefully, by taking on board good advice, I can start relying less on instinct and more on actual knowledge and technique. 