Frownland

Looks good to me. If you slap the end of it with your palm and it makes a good sounding tonal "thump" then it has a good enough seal.

If you know the basic embouchure then it just takes practice from there. Each didgeridoo has ideal notes, so try loosening or tightening your lip technique to find the sweet spots of your particular instrument. The "thump" note is a good indicator of its "home note" (a term I just made up) and it follows a pretty standard overtone series from there.

By breathing technique do you mean circular breathing? I've never been able to get a hang of it, but it's a great leg up if you're good at it.

For a starter jam, I'd go for playing the didgeridoo holding it in one hand and having a percussion instrument/drumstick in the other.

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