I would help you through the entire thing Vuk, but I am experiencing intense sadness and loneliness right now. If I remember correctly, the key to the 4 was that the top row has two cells one which has 2,5,7,9 and the other 2,4,5,7,9. Takes a bit of intuition but you know that since the numbers 4,5,7 appears among the other empty cells in the row, you can figure out that those cells are actually a pointing pair of 2,9. Since you have eliminated that top right cell to be 2,9 there is only one cell left in that 3x3 block for the 4 to be in.
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