/ic/ - Artwork/Critique

All right, I'm not having a good time with this. I don't understand lineart, and it's not the "I can grok it if I watch some tutorials" type of not-understanding, I feel like I'm missing something basic here. Artists I follow have very crisp lines that start and taper neatly, even at their beginner stages, but I can't seem to get these no matter which brush and stabilizer I try. Curves are completely impossible, I've just about given up on breasts.

Is this a software issue, do I need SAI or Photoshop rather than Krita? Or does it have to do with practice, and if so, what exercises should I do to fix it? I don't know how to draw clothes/accessories, so everything I draw has few lines and little variance in line thickness. Maybe this is why things look off if I can't get body contours exactly right, and I can distract the eye if I added clothes. Would studying that help?

Once I get lineart right on this, I plan to follow some of Hyanna Natsu's videos to try my hand at proper rendering. I also need to look into the 'contours of the female body' book on panda.