Hey Chiko, you've updated a lot since I last visited.
The first pic in #89, not sure what's going on with the girl's legs on the left side... too much distance between them at the crotch. Legs are too thin and one of them looks like it was broken badly multiple times! On this page and on the third one in #85 there is some issue with proportions. Maybe it's the model who's posing for you but the legs are too thin and long in general, it doesn't look very good to me or erotic which I think is what you're going for...
Now the good stuff: the first sketch in #85 is awesome. Also the sequence of paintings with the girl and the guy in the background in #82 looks promising but you seem to have dropped the guy once you started painting over the sketch... looks a bit kinky with those chains
About your shading: as someone above said you just have to take the time. I have the reverse problem you have which I think is really a bigger problem... I tend to shade too much and forget working on form/proportions. My shading is excellent but at the end it gets undone because of not doing my homework before I go crazy on the shading.
Secondly, I think you're being a bit harsh saying you suck at it. Not having the patience and sucking are two entirely different things.
Also you didn't specify if you're concentrating on shading with pencil or digital. There are some really nifty tools/techniques you can use when shading digitally. I'm going to point you to a thread by one of my digital heroes on cgtalk in case you're using photoshop, you should try some of these approaches:
At the very top you can branch off to other really good threads too, but read the first 10 pages of this one and you'll get some really interesting ideas. Hope this helps bro.