I think the final clue is Land
which means clue 1s solutions are:
Picture 1 - Alexey Pajitnov Yes!
Picture 2 - MIR Yes!
Tetris Ending - Launching.
X marks spot - Landing
That takes us to Clue 2:
Leonardo Da Vinci - Yes! Wow, good job.
Coordinates - Yes but you're wrong.
Stars - Ooo really close here.
?? - You don't see it yet.
?? - Solve clue #1.
Leonardo - When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return i.e. you can go there and come back and will want to go again
Coordinates - the clues of how to achieve that
Stars - connect them like a puzzle, as in clue 1
?? - You don't see it yet - the actual launch and land spots???
?? - Solve clue #1 - discover you need a landing spot???

