Powerful image with great contrast. I like the sepia, and don't find sepia clicheed at all. Exposure is very good. It's monochrome. Anyway, I like it very much, but it gets a little distracting to look at with the crooked horizon (which can be corrected in photoshop if you're familiar).
What a neat subject! and I like the choice of sepia for this, gives it a very nostagic feel... A few things you might want to consider: I'm not sure if it was your intention to tilt the horizon on this, but for me it is distracting, either a little more tilt to emphasize the effect or no tilt would work better. Additionally, the horizon is dead center, and in some cases this works well, in this image it serves to effectively cut the image in half and create a fairly static image. As a suggestion, you may want to crop from the middle of the cloud down (in a square format). That way you don't loose the dramatic underportion of the cloud, but it effectively "pushes" the horizon up to the top 3rd of the frame and also emphasizes the layers that you have going in the image. The frame is a bit too heavy and pulls the viewers eyes away from the subtle tones in the picture. Finally, the sky, while having some detail, needs to be a bit more dramatic (although this is a matter of taste)... a bit of burning the highlights in the clouds and dodging the midtones will help them to pop a little.
This image has potential, play with the crops, the development work (or PS) and the tones and see what you come up with.
Lovely image. I find the sepia a touch clicheed, but it works well here and probably better than straight b&w would do. the frame really helps too, but maybe a touch too heavy.
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