Cataclysm-X has made many great tutorials which I found really useful when I was starting out [link] - I hope you find them as uselful as I did! Also, I found that I used to rush my drawings because I was so eager to finish them, so to prevent this I place a piece of paper over the page so I can only see one bit at a time. This prevents me rushing and also stops any dirt from my hand touching the paper. Sorry if I'm stating the obvious I've just looked through your gallery and you don't seem like a beginner!
Sorry about the late reply here, but thank you so much for directing me to Cataclysm-X's page! I'm really excited to start up some drawing practice again. And also, thank you so much for taking the time to actually give me pointers and suggestions, it means so much!