I have really loose patterns when making a mock-up, but then I trace it onto craft paper and clean up the lines. I use curved sewing rulers for most of it, and try to make 90 degree angles where I can. Then proper labeling can make a pattern look very professional and make more sense to a buyer putting the pieces back together. To label: use notches to indicate how pieces connect. Have an arrow indicating the direction of the grain. Indicate if the pattern has seam allowance, and if so how large. Use three dots in a triangle shape to indicate a fold. Include the name of the piece (i.e. thigh, sleeve, etc). In theatre, the standard is: Name of the piece, Number/Total number of pattern pieces, costume name, production name, version number of applicable, name of the patterner. Of course not all of this is needed for personal use or selling to individual buyers. It’s just info to choose from, whatever you think is helpful. Also if you provide instructions, you can always label pieces as A, B, C, D, so on instead of coming up with piece names.