Lovely hamster and great pics! You have done the right thing leaving him alone today! You need to build his trust slowly!

Just give him treats through the bars to start with.

When he's happy with that put your hand in to give treats.

Then put them on the palm of your hand so he has to come onto your hand.

Then further up your hand so he gets on all the way.

Once he is happy coming onto your hand you can pick him up but don't push it, wait until he is happy with it.

You may find he will let you stroke him at any stage but will probably not be so keen to be picked up until he fully trusts you.

Make sure you move slowly and so he can see you at all times!