Why do we use 楽しめそう and 楽しみ rather than 楽しい・楽しそう in these sentences?


Could someone explain why we use 楽しめそう instead of 楽しそう in the first sentence
and what exactly 楽しみ means and why?

(The translations are my best guess at what the sentences might mean.)

> この本は高いことは高いが、写真が多くて楽しめそうだ。  
>  It is true this book is expensive but it has lots of photos and looks like
> fun.
>
> 子供を育てるのは大変なことは大変だが、成長が楽しみで大変さを忘れる。  
>  Bringing up children is hard work terrible but you forget that because you
> look forward to when they grow up.




楽しめる - able to enjoy

  * 楽しめそう - seems that (I) can enjoy

楽しい - is enjoyable

  * 楽しそう - seems that (it) is enjoyable

楽しみ - enjoyment

[Quoting from sawa](https://japanese.stackexchange.com/a/3885/542):

> み is an affix that idiocyncratically attaches to some i-adjectives that it
> particularly selects. It only attaches to some selected i-adjectives and its
> meaning tends to be idiosyncratic, as contrasted to nouns created by さ.

Generally the difference between さ and み is that the former is used to
represent the degree of the state represented by the adjective, while the
latter lacks the "degree" nuance and instead represents a subjective concept.  
I.e. 悲しさ - sadness; 悲しみ - sorrow. 楽しさ - (degree of) enjoyment; 楽しみ -
enjoyment.




楽しめる - able to enjoy

  * 楽しめそう - seems that (I) can enjoy

楽しい - is enjoyable

  * 楽しそう - seems that (it) is enjoyable

楽しみ - enjoyment

[Quoting from sawa](https://japanese.stackexchange.com/a/3885/542):

> み is an affix that idiocyncratically attaches to some i-adjectives that it
> particularly selects. It only attaches to some selected i-adjectives and its
> meaning tends to be idiosyncratic, as contrasted to nouns created by さ.

Generally the difference between さ and み is that the former is used to
represent the degree of the state represented by the adjective, while the
latter lacks the "degree" nuance and instead represents a subjective concept.  
I.e. 悲しさ - sadness; 悲しみ - sorrow. 楽しさ - (degree of) enjoyment; 楽しみ -
enjoyment.

