Around two weeks ago I decided to post my very first artwork onto both E621 and Furaffinity. Despite the art being pretty flawed in several ways (also getting deleted off of E621 later), I'm still proud of it. Even then, I want to know if there are any specific methods I can use to practice my drawing skills. I've seen people often suggest the method of practice, but I personally believe the problems I struggle with are perspective/depth, shading, more intricate shapes such as hands (also maybe snouts, but I haven't tried them out before) along with anything similar to those, which practice may certainly help but I would like to get these problems out of the way beforehand. I don't have any actual equipment for drawing digitally other than my mouse and Krita (which is sort of why my artwork on paper is a tad bit better) so I will likely need to fix that, but other than that is there any specific way I can alleviate those specific issues?
Also, if there are any other sites where I can post my art (other than here and Furaffinity) I would like to know what some good ones are.