There both nice images, I prefer the first, you just need better sunsets.

For landscapes the Sigma 10-20mm zoom has to be a strong contender, value for money wise. You shouldn't have a problem with it's sharpness on a tripod and cable/self timer shooting.

Welcome my friend, hope you enjoy your stay.

Excellent set, love no. 4, great eye contact and love the framing and composition.

Have a read of this.link

The difference in images your describing is down to the way your viewing them. The pc image is backlite and the print is by reflected light. An image on the PC always looks better than a print. Ways to ensure they look the same are to calibrate the printer with your photo paper and ink. Are you using the printers recommended paper? your printer will carry the profiles for this paper. I dont do much printing, but you can set photoshop to mange printer profiles or let the printer manage profiles. I let the printer manage profiles.

First two shot's are really nice, the depth of field is perfectly placed, great work.

The last image of that stunning butterfly is beautiful.

One is a cracking shot, the path leads the eye in beautifully to the main focal point.