We have enough information to solve the marked row in this grid. We know that the first group of 2 has been determined, so we can mark the empty square that must be the next square to the right.
Also note that the final group of 2 filled squares has also been determined. As we mark the empty square directly to the left of the group, we see that there remain just enough squares to complete the group of 3 filled squares in the center. 

In this marked row, we know the location of 1 of the filled squares in the 2 square group. The other square can only be directly to the left OR directly to the right of the known filled square.
The remaining squares in this row must be empty.
I have marked them each with a dot.
We have discovered quite a bit of information to use in solving this puzzle. 

We can make some progress with the two marked columns in this grid.
There is one group of 8 filled squares in each column. There are 2 empty squares located between filled squares. Since there is only one group of 8 filled squares in this column, these 2 squares must be filled!
At the top of each column, there are only 2 available squares. They cannot be part of the 8 square group, so they must be empty! 

The row in this grid should be simple. We have determined that the first group of 4 filled squares begins in the very first box at the left. We can fill the remaining square to create the 4 block group and also mark the empty square to the right of the group.
We also see that there are only 4 remaining squares (2 of which are already filled), which must create our other 4 block group. This completes the marked row. (see next diagram) 

In the two marked columns, we see that the final 2block group in each column has already been determined. We can mark the empty squares directly above each group.
Once the empty squares are marked, the remaining groups in the first marked column are apparent. We see that all of the remaining squares must be filled to create the other groups. 

In the first marked row, the location of the 2block group is known. One square on each side must be marked as empty. Once this is done, the location of the single filled square is known.
In the second row, the 2block group has been determined. The remaining square must be empty.
The third marked row has enough marked squares to determine that filling in the remaining squares will create the two 3block groups and solve the row. 

Each of the marked columns in this grid contains one 6block group. By looking at the currently filled squares, we see that the empty square between the filled squares must be filled. This creates the 6block group, so the remaining squares should be marked as empty. 

There is enough information to solve each of the marked columns. In the first marked column, we see that the top square must remain empty, as it cannot be part of the 2block group. The location of both of the 2block groups is apparent and by marking the separating empty space, we reveal the location of the 3block group and solve the column.
In the second marked column, every remaining square must be filled to solve the column. The third column is quite easy to solve as well. 

We can now complete the each of the marked rows, by using logic to determine whether a square will be filled or marked as empty.
In the first row the 3block group has been determined, so the remaining square must be marked as empty.
All of the remaining squares in the puzzle will be filled to complete the groups of filled squares and solve the puzzle! 

Using the steps listed in this section, you should have no trouble solving the easy puzzles in this book. Work back and forth from column to row, and you will always be able to find a clue that unlocks more information and leads to solving the puzzle.
You will discover your own methods for solving Pixel Paint by Number Logic Puzzles and will be solving the tougher puzzles in no time.
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