How to Draw G In Bubble Letters
I've been doing custom lettering work for over a decade, and bubble letters are one of those things that look easy until you actually try to execute them properly. The G is consistently the most annoying letter in the alphabet for this style. Everyone can do an O or an A fine, but the G's tail always looks like it's losing a fight with gravity. Start with a pencil and light guideline. Draw a normal uppercase G first as your skeleton. This matters more than you'd think. If your underlying letterform is off, no amount of thickening the lines will fix it. The G needs a strong vertical stem on the left, a top curve that opens to the right, and a bottom horizontal bar that extends inward. Now comes the bubble part. Take your pencil and draw a second outline around your skeleton letter, keeping roughly the same thickness all the way around. For the G specifically, watch the bottom left quadrant where the stem meets the bottom bar. That corner tends to collapse into a thin point if you're not careful. When you hit that junction, pull your outer line wide and round before curving back toward the stem. You want a smooth U-turn, not a sharp wedge.
Erase the inner skeleton lines once your bubble outline is clean. Fill it in. Add a highlight strip if you want the glossy look, or just leave it solid. The highlight makes it feel more three-dimensional but it's optional. I usually skip it for simple designs. Here's the thing nobody mentions: the overhang. The G's inner horizontal bar extends inward and creates an enclosed negative space. When you're drawing the bubble outline around that inner edge, you need to make sure the thickness doesn't vanish. That inner corner is where most people's letters start looking like they have a dental problem. My workaround for this is to slightly widen the gap between the inner bar and the outer shell in that region. It's a subtle adjustment, maybe a millimeter or two depending on your scale, but it prevents the bubble wall from becoming impossibly thin. I ran into this exact issue on a job last year where someone wanted a G in bubble letters done at about eight inches tall for a storefront sign. At that scale, the thinning was obvious and ugly. I ended up redesigning the lower portion with a slightly more open counter and re-anchoring the bottom bar further out. It took ten extra minutes and completely fixed the proportion.
Common Problems and Fixes
Uneven thickness is the most common complaint. If your bubble walls are thick at the top but thin at the bottom, it reads as a mistake rather than a style choice. The fix is to measure as you go. Grab a ruler or just use your eye consistently and check the width at multiple points around the letter. Do it on paper first before committing to ink or paint. Another thing that goes wrong is the tail of the G. Some people make it too pointy, some make it too blunt. The sweet spot is a rounded termination that still clearly reads as a tail extending from the bottom curve. Think of it like a sausage that's been pinched slightly at the end, not a triangle. If you're working digitally, vector tools like the pen tool in Illustrator or the brush tool in Procreate both work. But I'd recommend drawing by hand first even if you plan to digitize later. Hand-drawing teaches you the proportions. Once you have the shape right on paper, scanning and tracing is straightforward.
Get the Full Details

The main limitation of bubble lettering overall is that it doesn't scale well to really small sizes. Below about two inches, the enclosed spaces start disappearing and the letters become blobs. If you need small sizes, consider a simpler rounded sans-serif font instead of trying to force bubble letters to work at that scale.
Quick Reference for Proportions
Keep the overall letter height consistent. The bubble thickness should be roughly one-fifth to one-sixth of the letter height for a balanced look. Anything thicker starts looking cartoonish, anything thinner loses the bubble character. The G's inner counter should occupy about a third of the total letter width at its widest point. If it's smaller than that, the letter feels cramped. Larger and it looks like you gave up halfway through. Practice with a grid. Lightly draw a square grid on your paper and place your G inside it. This helps you check that curves stay consistent and that the bottom bar sits at the right vertical position. It sounds fussy but it cuts down on trial and error significantly.