Improve your sketching abilities
You can improve your sketching abilities by doing this as a warm up before you sketch. Make two dots on a piece of paper then connect the dots with one stroke. Try to keep it as straight as possible then stopping on the second dot. You can tell by my example here that I was not perfect. But that is OK, do your best and do a lot of them. This is one of those sketch exercises that is always beneficial to perform no matter how good you get at it. Fill a page full of these from long to short. This simple exercise helps your hand match your brain. I know when I first started drawing I always had a hard time drawing and sketching what I was thinking about. It takes time to train our hands to match your brain. I still do this exercise today to warm up and to help get my brain synced up with my hand.