Use the same style and size for labels. Use as few different styles of plots as possible. If at all possible, use the same character type and character size in all your plots. Look what the journal wants . Read the notes for authors.
Some journals require triple stereo plots.
Some journals allow a limited number of figures. Some journals do not accept colour pictures. Don't write labels through the lines . If you add labels to a line drawing, take the extra hour to optimise the position of the labels. You spent several months on this article, so, the extra hour to make a nice plot out of a poor plot is worth it.