I'd be glad to help! Let's take your questions one at a time. The first poem is very good! The only suggestion I would make is perhaps to say "The scent of beautiful flowers" [or you could use other adjectives like "blooming flowers" or "spring flowers" or whatever]; scent has a more positive connotation than smell.
For the next one, I like both of them; I think you could take parts from each and make it even better, perhaps like this:
From the first time I met you [it's not grammatically correct to say "have meet"]
Every sight has changed in my life
Even as I walk on hard bricks
They feel like soft smooth sheets of linen
Under my feet
In darkness, I see light
In day, I see night
There is intoxication in your eyes
That makes me crazy
I have searched for you everywhere
Above and under the sky
On river waves
Droplets of water touch
Just like your hands
Is this love that has captured me
A strange ecstasy delights
If that makes it too long, you could take out the river waves part.
I like writing haikus about nature. The thing is to just sit still first and picture what you want to say, without words. My favorite part of nature is sunsets, so I would write something like this:
The sun says good-bye
Setting fire to the lake
As my dreams awake
(I counted "fire" as having two syllables).
I think limericks are lots of fun! It's important to get the rhythm going in your head. Play around with it on paper (or monitor screen) for a while and see what you come up with. It helps if your last line is rather amusing. Here's one I came up with:
There once was a farmer named Weiser
Who horded his cash like a miser
His goat found the stash
And chowed down on the cash
Now his money's become fertilizer
Probably the more limericks you read, the easier it will become to come up with your own ideas. Good luck!