I think that they look fine, you can put the knots where you want. Yours don't look like they're to tight, smashed into, or deforming the pouch. Some people put the knots on the inside, so they don't scratch their cheek on the way by.
Because every roll of band is a bit different, especially on the real thin stuff, I check the elongation factor first, so that I can maximize the amount of band needed. Some Theraband might give you a 3.5, where others will give you 7 or 8 and you can't truly determine the active band length until you've stretched it to the max to see what the band is doing. You just take a thin section, place a couple of marks on it measured out to... I either use exactly 1/2" or full inch marks, then I clamp one marked line side into my plastic jawed vice, lining the first mark up exactly on the edge of the the jaws, stretch it out until it stops, and measure the exact elongation factor from the vice - to your second marked line and do the math. This way, your insuring exactly how long your bands can be without being overstretched. Some people just measure from line to line, but because the lines stretch out also, I measure from the vice, where the first line started, to the outside of the other line. This way, I maximize the power that I can achieve from each roll of latex. Some people drop back a number or 2 to get longer band life out of it when they do their math, but the choice is yours
