A jar of honey or a bottle of sauce sitting on a shelf next to a dozen near-identical competitors has maybe half a second to catch someone's eye. The label is doing almost all of that work, which is why small businesses often over-invest in the product and under-invest in the label.
Account for the curve
Text near the edges of a wrap-around label distorts slightly on a curved bottle. Keep your most important text (the product name) centered where the curve is flattest, and treat the edges as decorative space rather than critical information.
The product name should win from three feet away
Stand back from your screen, or better, print a test and hold it at arm's length. If you can't read the product name instantly, it's too small or too busy — everything else on the label is secondary to this one job.
Don't compete with your own contents
If the product itself is colorful (a jam, a sauce, a colored liquid), a busy label design fights with what's visible through the jar. A simpler black-and-white label often reads as more premium precisely because it lets the product show through.
Ingredients and fine print belong on the back, not squeezed onto the front
Front labels sell the product; back labels inform the buyer after they've already picked it up. Trying to cram both onto one small front label usually makes neither job easy to read.
Consistency across your product line matters more than any single label
If you sell more than one flavor or size, keep the layout structure identical across all of them — same logo position, same font, different accent only where the product actually differs. That consistency is what makes a small brand look established.