Is this ok for a haiku?

Ok I suck at poetry, and haiku's generally seem to be the easiest poems to write. They are meant to be about nature I'm told, but I wrote this, and I'm not sure if it makes sense :)

Trying to write a
good haiku, is like trying
to ski with no snow


Or what about this one

Being brilliant
does not come easily to some
but for me it does!

Yes I know I'm not brilliant, that was my attempt at irony

or this

this haiku would be
good, if it was longer but
I'm afraid it's not


last one

the jelly fish is
an amazing speices, in
lots of nice flavours.


Yeah, I guess they are all pretty bad. Back to the drawing board I think

xxx