Hey Lizmo,
These are my thoughts on the photos. Keep in mind, I'm being very nit-picky because you are thinking of selling them. And let me say up-front that I really like these, but I'm basing this on what I'd expect out of photos I was going to buy (or attempt to shoot myself to hang on the wall).
Post 1:
1) This is too blue. Adjust the WB so it's warmer. The detail is great but the background is a bit too cluttered. If you're aiming to sell flower shots, try using a black background to isolate the flower and make it stand out.
To fix this, try isolating the the background from the flower and applying gaussen-blur, a marginal tone adjustment and maybe even a slight hue adjustment. You could also de-saturate the background a bit to help it pop.
2) This one is very well done. I think it could use a bit more warmth but you're exposure is perfect.
3) This shot looks like it was done near mid-day. I'd recommend that you work early in the morning or around sunset so you get some reds/golds in there as these colours sell. If you're going to shoot between 10am and 4pm, I'd recommend you get a polarizer to help with the sky.
Another thing with most landscapes is there's a leading line which takes you through the frame. This seems to be divided by the road going one way and a lake kind of complimenting the line but competing for attention. If you're serious about selling landscapes, I'm going to recommend you go to the Singh-ray web-site and check the galleries and blog. You don't need to copy the images there, but use them to inspire what you're doing. One of my personal favorite photographers is Darwin Wigget, who has photos there. Keep in mind, they're selling high-priced filters which you don't need. Look at the composition and colour. You can do most of that in Post-Processing.
I love shooting landscapes and I find myself continually learning from what some of these photographers are producing.
singray.com
4) The sky is blown and the sepia tones and sharp detail of the grasses almost hide the subject. I'd recommend getting closer in this instance (not too close) so that Blaze stands out more but still include some of the environment. Let him take up the better part of 1/4 of the frame. If it's going to be with a super bright sky, consider excluding the sky from the shot.
By getting closer to Blaze in this insance, his dark & white areas will contrast with the background better, whereas he's blending in right now.
5) I love the fact you're not afraid to shoot into the sun. You also have a good exposure. Splitting the frame mid-way is a mistake though. I think if you would have got lower to the ground so the tree on the right was more in the sky's space, that would have worked better. I'd also recommend excluding the soil in the fore-ground and starting the bottom of the frame with the grass. This would put the horizon about 1/3 of the way up, which would work better. You could also try putting the horizon 1/3 of the way down and see where that leads, but the tree on the left gets lost in the details of the grass, so it would be a different shot altogether.
6) Those eyes make the photo. Do that without the chain-link in the background or include more of the ball-diamond in the frame to give the shot context would be the only improvement. You could also try lightening they eyes a bit, but that's such a small thing. Even dark, they grab you.
7) Another beautiful shot. I like the framing of this better than the previous shot but I like the colours in the previous shot better. Those eyes stand out beautifully.
8) Very interesting and great textures here. If you're going to get it mostly centered, pay attention to where you're standing so you get equal space on each side. Otherwise go for the angle more than you have here.
I'm interested in what the stone says
9) Great detail and the different coloured flowers in the background help. Again, it's too blue.
In Post 10:
1) I like that you got rid of the road. I think this should would have been better had you got right down to the lake though. Also, I didn't mention this in my previous rambling, but the horizon would have been better a bit higher up in the frame.
2) That blue cast is killing the red and yellow. You've isolated this flower beautifully though. Fix the colour and it's there.
Conclusion:
You have a great deal of potential. I'd say in most cases you're 80% of the way there or further. It's the additional 20% which is going to grab peoples attention when it comes to selling photos though. That's what's going to take you from being a very good photographer to being an excellent photographer.
