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I will appreciate feedback and good ideas how to improve my skills.

Kind regards,

Jens

Hi Jens.

You don't give any details about the lens and settings, and cropping of original image.

Judging by the sand grain this is a fairly small crab. They don't stay still for long, especially if you get too close, so I'm guessing you're using a fairly long lens. It's on auto-focus as its focused on the back of the crab with slight out of focus on the claws at each side. You seem to have quite a reasonable depth of field, so would guess you stopped down quite a bit. 

Could stop down to max lens allows but then shutter speed gets slow and camera shake sets in, this isn't a tripod type of shot unless you are very lucky or patient or both. High iso also adds noise.

Composition wise shows the crab and its habitat to good effect.

All in all good shot.

I usually try to use critiques to offer constructive criticisms, but on this shot I have none.  Excellent color, eye-grabbing composition, kudos!