this one is nice and well handled as are your other uploads. as you seem to favour low light seascapes i d suggest that you check out a couple of members on epz who are favourites of mine and both specialise in seascape.
its all about dynamic range and your sensors ability or rather inability to capture the full range of the exposure between the highlights and darker areas. subject to the level of contrast and whether the sun is included or not, the difference between the sea and sky will often be between 2 and 5 f stops.
you can help to reduce the contrast by keeping the sunball just outside the edge of frame.
the first thing you need to do is shoot in raw because this enables a variety of adjustments and allows you to make several exposures from one raw to enable a degree of exposure blending in raw. i often adjust the raw to give a best sky and a best sea and copy one layer over the other and erase the layer to reveal the best compromise.
but you must have in your kit at least 2 graduated neutral density filters. if you choose Lee or hitech they come in hard or soft edge and 0.3 / 0.6 / 0.9 0.3= 1 stop 0.6=2 stop 0.9= 3stop
they are not cheap and Lee are my personal favourites. i have too many and if i had to choose just 2 it would be 0.9 hard and 0.9 soft the soft enables a little lattitude as you can slide it up or down to increase the effect a little and i often use them together. a 0.9 soft would have covered most even toned images like yours but with a brighter sun you may well need them both together. if you must include the sunball then you can get some with the grad reversed and they are dark on the horizon line fading upwards and they are good with unobstructed horizons such as seascapes without rocks breaking the lines.
if you check out pmorgan, on epz contact him and i believe he sells a CD with comprehensive details on his processing methods and im sure that seldom do his images come direct from the back of the camera so to get the very best effects, photoshop skill may well be required.
Willie has suggested a colour balance adjustment and although thats a right and fair comment, my own experiences tells me that sunrises and sunsets take a huge range of hues and this can change from country to country too so adjust to how you see it or remember it but here it could be a little cool in the sky but it suits the water well.
Hope this helps