3 Takım elbiseli bir bey. O bıyıklı ve sakallı. Elinde bir şemsiye var.

Takım elbiseli bir bey.

A gentleman in a suit. A suited gentleman.

O bıyıklı ve sakallı.

He is with a moustache and beard.

Elinde bir şemsiye var.

He has an umbrella in his hand.

Note the constructıon of in his hand

el (hand) + i (possessive suffix for his/her/its) + n (buffer letter) + de (suffix for in/on/at) = elinde

(benim) elimde = in/on my hand

(senin) elinde = in/on my hand (el + in + de)

(onun) elinde = in/on his/her hand,

If we did not have a previous reference, we would need to say onun elinde to clarify the sentence.

4 Kısa saçlı ve kısa pantolonlu bir çocuk. Elinde bir top var. Çok yaramaz görünüyor.

Kısa saçlı ve kısa pantolonlu bir çocuk.

A child with short hair and (with) short pants

Elinde bir top var.

He has a ball in his hand

Çok yaramaz görünüyor.

He appears very naughty

5 Kırvırcık saçlı, zayıf bir kız. Bir sırt çantası var ve elinde kitap taşıyor. Galiba üniversite öğrencisi.

A girl with crely hair ,she is thin ,she have a back bag and holds a book she is seems a universty student.

my try ,maybe my english not good in this sentence

Your main elements are correct Nifrtity, but as you realise, your English needs help.

Kırvırcık saçlı, zayıf bir kız.

A slim girl with curly hair.

Bir sırt çantası var ve elinde kitap taşıyor.

She has a backpack and is carrying a book in her hand.

 Galiba üniversite öğrencisi(dir)

It looks like she is a university student 

In English we use ´backpack´ for a bag that we wear on our back to carry things.

Galiba means ´it looks like, it seems´. Here ´it looks like´ fits better. In English we could also say ´she looks like a university student´ or ´she seems to be a university student´. (O üniversite öğrencisine benziyor?? is my attempt at the Turkish)