Ok, I've been practicing lines and dots til I'm seeing them in my sleep. I do fine with the back and forth lines, straight and mostly on the money, but I cant keep a straight line when I go up and down. I can't post a sample yet, (too new here), but you know what a crooked line looks like anyway. I guess I use the body for the side to side motion, but the up and down breaks the bracing that I have worked out.
Well being you have now passed your 5th post you should be able to upload a picture . Now here is how to do it , When you click on reply yo post , you will notice 3 tabs on the lower right hand side
post quick reply go advance and cancel.. Click on the go advance.
Now you will see a screen that looks more like the one did when you made this thread. look for the paperclip icon and click on it. Now just hit select file and upload it ..
As far as up and down , I lock my elbow ti my wide and move my hands up and down . This seems the best way to get straight lines.
But if you are seeing them in your sleep , you know what that means ,,,, Time to paint a picture... The Eye comes to mind. for a good starters piece but it can be anything you want it to be,
the main thing is to have fun doing it.