"wuv... twue wuv...."
Seriously, very nice work. I have a hard time with sentimental things, I don't think I've bought a sentimental card in 5-10yrs. Probably some deep physcological scarring in childhood.....or something.
anyway, I said seriously, right? I see what jen is saying about panel 1, just not sure I agree. When I look at them all together, panels 1 & 3 go together and panels 2 & 4 go together, in an alternatiing pattern. I feel like anything you do to 1 you would then need to do to 3 or it would be the standout. The more I look at it, I think I would vote to make all 4 panels the same. So, darken panels 1 & 3. I don't think you would lose the light airy feeling. Or, not, I think it works fine as is.
I didn't think it was too hard to read. I liked the push pull of the text, and felt that you did a good job of integrating the text and images.
What I first noticed was the castle in panel 3 seemed a bit out of style with the rest of the images, but then I re-examined the other panels and saw the same cloud shapes, so it fit a little better for me then.
One other....I agree about depth and range being a good thing, however, this is quite a contrast to the last one, so if it's a bit out of the norm for you, don't make it the sole sample of that type in your portfolio, reserve it incase you're asked for other work, know what I mean?
All just my humble opinion.................