Greetings,
As has been already noted above, by both yourself and others, you see the basic motifs and moves - the problem is that you're not trying them in different orders. Without meaning to sound facetious, that's the point of "combinations"!
You need to list all the possible checks and captures (and threats to do so) in the position - then try them in different orders. This needs to be done for both sides to ensure that the opponent doesn't have a "killer" reply. perhaps most importantly, this needs to be done at each move for either player.
As swingdoc points out, you need to practice on complex positions as a means of honing your combining skills.
Peter Griffiths, in his book
Better Chess for Club Players, makes a number of interesting comments whilst annotating games played by club players:
Quote:...especially if sharp positions are not your strongest point; so first make a list.
Quote:If you want to improve, you just have to take the plunge and start practising sharper play, the sooner the better.
Quote:(Now Black) sees the combination the wrong way round. Bear in mind that there are many occasions when a change in the move order can make all the difference in a tactical idea.
In these and other comments he makes throughout the book, it is driven home that if you wish to pursue an attack (whether on the king's position or in general), you must train yourself to calculate accurately - there is no other solution to a successful attack (or defence).
Bearing the above comments in mind, you may like to have another go at both diagrams and give as full an analysis as you can.
Kindest regards,
Dragan Glas