You make yourself look more professional. You're offering your services- that's certainly a nice thing to do. However, you put less than a minute in this post- I can write this post that I'm posting now, in five minutes, and it's gonna be way longer than yours.
You're offering your services, yes good. But no one's going to accept that help unless they're desperate, they don't think too deeply, or they're a good Samaritan.
You want to post images or links to images of your builds, what would be your credentials and resume on Minecraft. People might assume that you're one of the griefers of Minecraft, and not bother talking. Likewise, they might want to have a more professional, at least on the outside, player who appears more qualifed.
For example, this is what I'd say:
Hullo- thanks for stopping by.
This is just a short post of me saying that I'm offering my services to anyone who needs them- that is, administrative and constructive support and assistance. In other words, if you really need an admin, lemme know. If you really need a builder, lemme know. I'd say from a scale of 1-10, I'm a 7 or 8 in administrative capabilities, with decent hours that allow me to get on, and I'm a 8-9 in terms of building, depending on inspiration.
Here's some examples of my builds:
[Spoilers with pictures of them, of my builds]
And here's some links to server websites, where I am an administrator and people are giving me recommendations:
[Link to a website, a specific page where people are saying good things 'bout me]
So yeah- if you need help keeping the griefers at bay, or with making a shiny pretty spawn, just let me know! I can work independently on Single Player (Inspiration and ETA vary), Private MP (Less variable; more consistent), and Public MP (Same with Private). If you want me to work on a server, just send me a link to a website, if it has it, maybe a description and an IP.