The DLSR look is clean ma man. you chose some nice locations for your shots. Out of these: # 1, 5, 14, are my favorites.
The biggest thing you could improve is your style. Even though you're taller, your friend stands out more in the pics because his outfit is better than yours. Try adding accessories like bracelets, rings, necklaces, and/or a watch if you plan on wearing just a t shirt. Also all your outfits are all one color which won't look great over multiple pics. Try an outfit with a fitted white tee and experiment with other colors. Black and white outfits always look fresh. Guy outfits are pretty simple. Fitted Shirt and pants, cool shoes, cool outer layer, + accessories and you made an outfit. Here's a quick video showing how easy it is to make one.
https://www.youtube.com/watch?v=pTkmlUH8pv8&list=PLKiXZmnc_ZYJUIcJwvnzRSV_371hmANev&index=29
Best of luck on your quest. Your pics are defiantly improving.