If you want to try, do it. If you can take decent hall shots, you can make a decent photoshoot. Only after you've tried you know if it's something you like to do or not ^^
Personal comments :
1. I would have cropped the top to make it a square : the big empty space above does not bring much to the photo. I like the light though, and the cosplayer's expression is nice. Thanks to the tilt, the modern architecture becomes an abstract background.
2. Here on the contrary the tilt does not add anything for me, and it cuts a foot when you could have had a clean full body shot at this distance. The colors are nice, but the cosplayer's eyes are in shadow, and the pose looks awkward.
When doing a photoshoot, technique is not everything, you also have to direct the cosplayer - suggest him poses, or at least correct the ones he found himself ("move your hand just a bit lower" "tilt your head up" "look in that way" "your smile is tense, just relax a bit and then we'll do that pose again"). Don't be shy, talk, and have fun while shooting ^^
Just try to bring the character to life : the best cosplay photo is always the one on which you instantly recognize the character ^^