Note: Edge blending takes place after each step. Click on the image to see it in original size.

Step 1 reference image: (254, 106) (368, 119) (354, 225) (333, 108)
input image: (105, 98) (220, 110) (202, 217) (185,99)
Step 2 reference image: (484, 85) (523, 222) (491, 136) (398, 224)
input image: (188, 47) (213, 200) (189, 105) (72, 209)
Step 3 reference image: (557, 123) (602, 191) (636, 182) (639, 111
input image: (71, 102) (99, 181) (144, 170) (177, 84)
Step 4 reference image: (712, 110) (765, 103) (811, 238) (690, 238)
input image: (113, 94) (196, 79) (180, 251) (12, 255)
Step 5 reference image: (832, 196) (846, 108) (784, 140) (902, 188)
input image: (32, 200) (155, 86) (17, 133) (160, 201)
Final Result