Hi! I am happy that you like my patterns. If you want to make a larger pouch, you can simply make more chains (any number is fine) in the beginning of the pattern and then add rows depending on how big your pouch should be. Each additional chain will add two new stitches in the color chart because you work on both sides of the chain. So, if you chain 37 instead of 36, you will have 74 stitches instead of 72. You have to adjust the color chart if you want the crown to be centered. Since you add 2 stitches to the pattern, you have to add 2 offwhite columns in the chart: one on each side of the crown (for example, column 40 and 68). So, the picture of the crown will start in column 42 and it will end in column 68.
If you want two additional chains in the beginning, you will have 4 additional stitches in each round, i.e. 76 stitches in total. Then for the crown to be centered you need to add 4 columns in the color chart: two offwhite columns on each side of the crown (then the crown picture will start in column 43 and end in column 69).
If you would like to make the pouch taller, just add some offwhite rows below and above the crown picture (for example, shift the crown picture 1 row up and add rows 25 and 26, in this way the crown will stay centered). I hope that this helps 🙂