[Death by Mirrors]

Glitch, it is totally reasonable.

First of all, your art looks great. I would believe it if you said you were a full time comic artist / animator / whatever. Your art does have this certain professional air about it.

Second, time. It takes you some to complete the commission, and it probably took you even more to get to this point (now of course it would be ridiculous if one single person had to pay for an artist's whole tuition all alone, but I do believe time contributes to overall value - not just the time you spend on the drawing itself, but also the fact you already had to practice to get that good).

Third, anyone who says they would buy at lower prices aren't likely to buy at all. Nowadays people often think they're entitled to creative work for free (or super cheap). As in "you enjoy what you're doing, so I'm giving you a chance to do it, why do you expect me to pay for that now?!" Well sure, but fun alone doesn't pay bills, and maybe some artists would rather draw different things than that 'Egyptian god Osiris humping Deadpool' image you requested. So essentially people are saying "I like your art, but I don't want to pay for your time". Ironically the very same sort of people has no problem to shell out five bucks for a fancy coffee and several hundreds for trendy clothes to dress like sophisticated art lovers.

In short, your prices are fair. Don't let anyone tell you otherwise.