If you're sketching buildings, or views in general and have trouble with angles, then try this little tip.
Get a piece of clear acetate. You will need to support it as it can be quite floppy to hold, so I used two mount boards for mine and taped them up, this holds the acetate nicely and makes it easy to hold.
For my example I'm just showing a line of hills, but this could be the tops of buildings...You will need to use a fibre pen eg: tikky graphic, uniball etc that sort of pen ~ or any that will show the lines on the acetate (I then just use a wipe to clean it off afterwards)
When drawn, hold the acetate over your paper and follow the lines with pen or pencil......
Top Tip: it helps if you close one eye for this...it focuses you better.
and there you have it
A simple way to get the Outline you want, especially if you are
en plein air drawing.
~ hope this tip helps ~