Okay so i suck at explaining things but I'm going to try my best here.

First, Ты will open both of these pictures:





Set their size proportions to 533x300. [Make sure Ты have the option to 'Constrain Proportions' selected - this way when Ты put in your width, 533, it will automatically make the height the correct size, 300.]

Далее step - now that Ты have both Обои resized, open a new canvas/blank background & set it's size to 265x265

Drag both Обои to the new canvas - At this point your new canvas should look like this:



Ты should have Layer 1 underneath Layer 2.

Now to the erasing part - Ты want to erase everything [on Layer 2, your вверх layer] to the left of Regina's body and hair.

When Ты go to erase close to her body/hair, make sure to do it carefully so that Ты only get rid of the rest of the image & not parts of her. To help make erasing easier, check that your eraser brush settings are somewhere close to this:

Hardness: 25-35%
Size: 35-45

To change your setting, click on the eraser Иконка and then click on the brush Иконка along the вверх bar [below File, Edit, etc.]

Now your Иконка should look like this:



I hope this was somewhat helpful! Sorry I'm so horrible at explaining things.