I've had a similar experience. My work right now can be roughly described as engineering. However I've had a brief experience of trying to market myself as an artist/photographer about three years ago (I did photography as a hobby). People in the arts community are very picky when it comes to design. I had to learn nearly everything by myself. I found that as I was learning more about design, my outlook about art in general started to change, which in turn started to affect my photography (i.e. my content). Design is a very subtle thing. It is a mistake to think about design as "making things pretty." Design is communication. Everything you do reveals something about yourself. Design is about taking control of what the choices you make reveal about yourself.

A lot of engineers I know have the attitude (it's almost a cliche to say it) that "design is unnecessary; things don't have to be pretty." They say that because they have never experienced great design or have never had a chance to work with great designers. Great designers do not make things pretty; making things pretty for its own sake is frowned upon in the design community. This is not the 19th century when design amounted to putting in as much ornament as you could fit. The best 20th century design was closer to "information design" than to decoration.

Some of the greatest designers of the 20th century were also engineers and architects. Charles Eames was an expert in structural engineering and materials science, which gave him a distinctive edge (Charles and Ray introduced many new materials such as plywood, fiberglass into their furniture designs). Muller Brockmann (inventor of the "grid") was extremely precise (as well as concise) with his poster layouts -- as precise as any engineer is with the blueprints.

A related tendency some engineers have is that they dismiss the expertise of people who went to a design school or an art school. They assume (incorrectly) that whatever they themselves "like" will also be liked by other people. In this regard, I blame engineers more than I blame designers. Designers (at least all the good ones) understand that engineering is a complex domain and that they have to listen to the words of people who have studied it and/or are doing it professionally. Engineers, on the other hand, have this tendency to look down on art and design as "soft" subjects, to view them as unnecessary, and they tend to be dismissive of people who studied it. This attitude is self-defeating, however, since it only contributes to the proliferation of bad designs, which in turn gives the advantage to good designs because they start to be seen as "rare" and distinctive.