first lets see the difference between a unwrapped sphere using mark seem vs one without using mark seem

with mark seem :


without mark seem :


- Q&A :


1-1 why this matters ? well later when you are using a handmade texture for something like body
or a face you need a good uv map so you be able to tell which one is the hand or which one is the front of the face.

1-2 let me show you a example of good uv map :



* note : you can easily say which one is the hand and which one is the pants. this is a good uv map.


2-1 why we need good uv map like this ? because most game texture are like this :


i know its weird

so lets start the guide ...

first you go to skatchfab or polyhaven and steal a free 3d model in this case we use a female model
that i just stole from someone on skatchfab because im lazy to make one.

this is our model :

* NOTE : i m going to show you one easy part which is hand (because im lazy)


1-1- separate the hand like this :

1-1-0.5-to do that after you selected the part you want to separate right click and click on separate and then selection like this :





























.
1-2- look at your collection menu on your right now you have two object first is the body and the 2nd
is the hand its something like this :

1-3- after you done with this part delete the objects you don t need.

2-1- position your model like me :


2-1-1 side :














2-1-2 front :














2-2 marking seem is based on textures hand has to part front and back so we need to mark between the finger


-----------------------------------------------------------------
* NOTE: to understand better we draw line like this :



RED : mark seem
GREEN : front
YELLOW : back
-----------------------------------------------------------------
2-2-1 lets do it on software









go to edit mode and select like me :





front :












down to up view :










2-2-2 go to top of your screen and select UV or press U key



2-2-3 select make seem -->


NOTE : your model now should be look like this :

3-1- from the top menu click on uv editing :



3-2-1-after you went to uv unwrapping menu select UV from here and unwrap ur model while selected :










3-2-2- after you unwrapped your model it should be look like this on the left menu :







3-3-3- position them like this :

4-1-1-from the top left menu select this :



4-1-2- select your hand reference mine is this one :













4-1-3- select your hand model again and start position them like this :



NOTE : becuase we dont have custommade texture for this we have to manuly position them on pic


4-2-1- after you done with that , look at your right side menu you should see a globe on very end
like this image :



4-2-2- click and add new material :






























4-2-3- click on the yellow dot next to base color like the image :


4-2-4- select image texture and when a new menu pop up under the base color for you select this and chose the same image we import before for hand
4-2-5- new go to this and click on render preview like image:








done

1- if you have any question i hope i can help

2- this guide is for beginners if you are a pro blender user this is not for you

3- in this guide i tried to use a method that is 1- easy to learn 2- its low- end friendly so everyone can use it on their systems.


enjoy...