First the image "q7MBs09" is just the same room scene as the later imgur
Some things to consider first.
That room scene is quite small 624x352 pix so any photo of yourself will have to be scaled down accordingly. It is not going to be wonderful.
Need transparency so add an alpha channel and the background has to be removed.
The orientation has to roughly be the same as the room scene. And that is isometric, 30 deg off horizontal.
You might have something like this, https://i.imgur.com/Wvjhw4K.jpg Scaled down after a bit of measuring, erased the background but facing the wrong way. Flipped the image to correct.
There are several cartoon-ish filters around. Gimp has one in Filters -> Artistic but I used one from the gmic plugin http://www.gmic.eu Note there is a separate version of gmic plugin for the Gimp 2.8 you are using.
Once happy with the cartoon effect. Copy - Paste into the room. Move around. Anchor floating when finished.
https://i.imgur.com/s4lBjBW.jpg
Some things to consider first.
That room scene is quite small 624x352 pix so any photo of yourself will have to be scaled down accordingly. It is not going to be wonderful.
Need transparency so add an alpha channel and the background has to be removed.
The orientation has to roughly be the same as the room scene. And that is isometric, 30 deg off horizontal.
You might have something like this, https://i.imgur.com/Wvjhw4K.jpg Scaled down after a bit of measuring, erased the background but facing the wrong way. Flipped the image to correct.
There are several cartoon-ish filters around. Gimp has one in Filters -> Artistic but I used one from the gmic plugin http://www.gmic.eu Note there is a separate version of gmic plugin for the Gimp 2.8 you are using.
Once happy with the cartoon effect. Copy - Paste into the room. Move around. Anchor floating when finished.
https://i.imgur.com/s4lBjBW.jpg